update pod version and jazzy docs

update README
converted *Result types to new Swift.Result
2026-01-12 12:20:30 +01:00 · 2019-03-31 00:29:43 +09:00 · 2019-03-31 00:05:13 +09:00 · 2019-03-30 23:58:26 +09:00 · 2019-03-30 23:56:39 +09:00 · 2019-03-30 23:36:56 +09:00
526 changed files with 472203 additions and 4767 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ CoreStore.xcworkspace/xcuserdata
 .DS_Store
 DerivedData
 *.orig
+build
+Playground_macOS.playground/playground.xcworkspace/xcuserdata
--- a/.jazzy.yaml
+++ b/.jazzy.yaml
@@ -0,0 +1,15 @@
+author: John Estropia
+author_url: https://github.com/JohnEstropia
+github_url: https://github.com/JohnEstropia/CoreStore
+module: CoreStore
+readme: README.md
+include: Sources/*
+output: docs
+theme: fullwidth
+clean: true
+skip_undocumented: true
+xcodebuild_arguments:
+- -sdk
+- iphonesimulator
+- -scheme
+- CoreStore iOS
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode9
+osx_image: xcode10.2
 sudo: false
 git:
  submodules: false
@@ -10,27 +10,22 @@ env:
  - LC_CTYPE=en_US.UTF-8
  - LANG=en_US.UTF-8
  matrix:
-    - DESTINATION="OS=11.0,name=iPhone 8"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=10.3,name=iPhone 7"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=10.1,name=iPhone 7"          SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=9.0,name=iPhone 6 Plus"      SCHEME="CoreStore iOS"     SDK=iphonesimulator11.0  RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="arch=x86_64"                    SCHEME="CoreStore OSX"     SDK=macosx10.13          RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=4.0,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator4.0    RUN_TESTS="NO"  POD_LINT="NO"
-    - DESTINATION="OS=3.2,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator4.0    RUN_TESTS="NO"  POD_LINT="NO"
-    - DESTINATION="OS=2.2,name=Apple Watch - 42mm" SCHEME="CoreStore watchOS" SDK=watchsimulator4.0    RUN_TESTS="NO"  POD_LINT="NO"
-    - DESTINATION="OS=11.0,name=Apple TV 1080p"    SCHEME="CoreStore tvOS"    SDK=appletvsimulator11.0 RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=10.2,name=Apple TV 1080p"    SCHEME="CoreStore tvOS"    SDK=appletvsimulator11.0 RUN_TESTS="YES" POD_LINT="NO"
-    - DESTINATION="OS=9.2,name=Apple TV 1080p"     SCHEME="CoreStore tvOS"    SDK=appletvsimulator11.0 RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="arch=x86_64"                         SCHEME="CoreStore OSX"     SDK=macosx10.14          RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=12.0,name=iPhone XS"              SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=11.0.1,name=iPhone 8"             SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=10.3.1,name=iPhone 7"             SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=10.1,name=iPhone 7"               SCHEME="CoreStore iOS"     SDK=iphonesimulator12.0  RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=4.0,name=Apple Watch - 42mm"      SCHEME="CoreStore watchOS" SDK=watchsimulator5.0    RUN_TESTS="NO"  POD_LINT="NO"
+    - DESTINATION="OS=3.2,name=Apple Watch - 42mm"      SCHEME="CoreStore watchOS" SDK=watchsimulator5.0    RUN_TESTS="NO"  POD_LINT="NO"
+    - DESTINATION="OS=2.2,name=Apple Watch - 42mm"      SCHEME="CoreStore watchOS" SDK=watchsimulator5.0    RUN_TESTS="NO"  POD_LINT="NO"
+    - DESTINATION="OS=12.0,name=Apple TV 4K"            SCHEME="CoreStore tvOS"    SDK=appletvsimulator12.0 RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=11.0,name=Apple TV 4K (at 1080p)" SCHEME="CoreStore tvOS"    SDK=appletvsimulator12.0 RUN_TESTS="YES" POD_LINT="NO"
+    - DESTINATION="OS=10.2,name=Apple TV 1080p"         SCHEME="CoreStore tvOS"    SDK=appletvsimulator12.0 RUN_TESTS="YES" POD_LINT="NO"
 before_install:
  - gem install cocoapods --no-rdoc --no-ri --no-document --quiet
  - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
-  - curl -OlL "https://github.com/Carthage/Carthage/releases/download/0.26.0/Carthage.pkg"
-  - sudo installer -pkg "Carthage.pkg" -target /
-  - rm "Carthage.pkg"
  - npm install ios-sim -g
  - ios-sim start --devicetypeid "com.apple.CoreSimulator.SimDeviceType.iPhone-8, 11.0"
-before_script:
-  - carthage update --use-submodules
 script:
  - set -o pipefail
  - xcodebuild -version
@@ -39,8 +34,8 @@ script:
      xcodebuild -workspace CoreStore.xcworkspace -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Debug ONLY_ACTIVE_ARCH=NO clean test | xcpretty -c;
      xcodebuild -workspace CoreStore.xcworkspace -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Release ONLY_ACTIVE_ARCH=NO clean test | xcpretty -c;
    fi
-  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator11.0" -destination "OS=11.0,name=iPhone 8" -configuration Debug ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
-  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator11.0" -destination "OS=11.0,name=iPhone 8" -configuration Release ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
+  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator12.0" -destination "OS=11.0.1,name=iPhone 8" -configuration Debug ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
+  - xcodebuild -workspace "CoreStore.xcworkspace" -scheme "CoreStoreDemo" -sdk "iphonesimulator12.0" -destination "OS=11.0.1,name=iPhone 8" -configuration Release ONLY_ACTIVE_ARCH=NO build | xcpretty -c;
  - if [ $POD_LINT == "YES" ]; then
      pod lib lint --quick;
    fi
--- a/CoreStore.podspec
+++ b/CoreStore.podspec
@@ -1,17 +1,18 @@
 Pod::Spec.new do |s|
    s.name = "CoreStore"
-    s.version = "5.3.1"
-    s.swift_version = "4.2"
+    s.version = "6.3.0"
+    s.swift_version = "5.0"
    s.license = "MIT"
-    s.summary = "Unleashing the real power of Core Data with the elegance and safety of Swift"
    s.homepage = "https://github.com/JohnEstropia/CoreStore"
+    s.documentation_url = "https://JohnEstropia.github.io/CoreStore"
+    s.summary = "Unleashing the real power of Core Data with the elegance and safety of Swift"
    s.author = { "John Rommel Estropia" => "rommel.estropia@gmail.com" }
    s.source = { :git => "https://github.com/JohnEstropia/CoreStore.git", :tag => s.version.to_s }

-    s.ios.deployment_target = "9.0"
-    s.osx.deployment_target = "10.11"
-    s.watchos.deployment_target = "2.0"
-    s.tvos.deployment_target = "9.0"
+    s.ios.deployment_target = "10.0"
+    s.osx.deployment_target = "10.12"
+    s.watchos.deployment_target = "3.0"
+    s.tvos.deployment_target = "10.0"

    s.source_files = "Sources", "Sources/**/*.{swift,h,m}"
    s.public_header_files = "Sources/**/*.h"
--- a/CoreStore.sketch
+++ b/CoreStore.sketch
--- a/CoreStore.xcodeproj/project.pbxproj
+++ b/CoreStore.xcodeproj/project.pbxproj
@@ -27,7 +27,6 @@
 		82BA18AE1C4BBD3100A0916E /* DataStack+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */; };
 		82BA18AF1C4BBD3100A0916E /* CoreStore+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */; };
 		82BA18B01C4BBD3100A0916E /* NSManagedObject+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B50392F81C478FF3009900CA /* NSManagedObject+Transaction.swift */; };
-		82BA18B11C4BBD3100A0916E /* SaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EF21AFF846E0064E85B /* SaveResult.swift */; };
 		82BA18B21C4BBD3900A0916E /* ImportableObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8C1B9AA97D007C5CBB /* ImportableObject.swift */; };
 		82BA18B31C4BBD3900A0916E /* ImportableUniqueObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8F1B9AA991007C5CBB /* ImportableUniqueObject.swift */; };
 		82BA18B41C4BBD3900A0916E /* BaseDataTransaction+Importing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E834B81B76311F001D3D50 /* BaseDataTransaction+Importing.swift */; };
@@ -165,14 +164,6 @@
 		B52557881D02DE8100E51965 /* FetchTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557871D02DE8100E51965 /* FetchTests.swift */; };
 		B52557891D02DE8100E51965 /* FetchTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557871D02DE8100E51965 /* FetchTests.swift */; };
 		B525578A1D02DE8100E51965 /* FetchTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52557871D02DE8100E51965 /* FetchTests.swift */; };
-		B52661401CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B52661421CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B52661431CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B52661441CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */; };
-		B529C2041CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
-		B529C2061CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
-		B529C2071CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
-		B529C2081CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */; };
 		B52DD17E1BE1F8CD00949AFE /* CoreStore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B52DD1741BE1F8CC00949AFE /* CoreStore.framework */; };
 		B52DD1931BE1F8FD00949AFE /* CoreStore.h in Headers */ = {isa = PBXBuildFile; fileRef = 2F03A53519C5C6DA005002A5 /* CoreStore.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		B52DD1941BE1F92500949AFE /* CoreStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2F291E2619C6D3CF007AF63F /* CoreStore.swift */; };
@@ -189,7 +180,6 @@
 		B52DD1A01BE1F92C00949AFE /* UnsafeDataTransaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EED1AFF846E0064E85B /* UnsafeDataTransaction.swift */; };
 		B52DD1A11BE1F92C00949AFE /* DataStack+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */; };
 		B52DD1A21BE1F92C00949AFE /* CoreStore+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */; };
-		B52DD1A31BE1F92C00949AFE /* SaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EF21AFF846E0064E85B /* SaveResult.swift */; };
 		B52DD1A41BE1F92F00949AFE /* ImportableObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8C1B9AA97D007C5CBB /* ImportableObject.swift */; };
 		B52DD1A51BE1F92F00949AFE /* ImportableUniqueObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8F1B9AA991007C5CBB /* ImportableUniqueObject.swift */; };
 		B52DD1A61BE1F92F00949AFE /* BaseDataTransaction+Importing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E834B81B76311F001D3D50 /* BaseDataTransaction+Importing.swift */; };
@@ -297,6 +287,10 @@
 		B546F9741C9C553300D5AC55 /* SetupResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B546F9721C9C553300D5AC55 /* SetupResult.swift */; };
 		B546F9751C9C553300D5AC55 /* SetupResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B546F9721C9C553300D5AC55 /* SetupResult.swift */; };
 		B546F9761C9C553300D5AC55 /* SetupResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B546F9721C9C553300D5AC55 /* SetupResult.swift */; };
+		B5474D152227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
+		B5474D162227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
+		B5474D172227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
+		B5474D182227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */; };
 		B5489F3F1CF5EEBC008B4978 /* TestEntity1.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F3D1CF5EEBC008B4978 /* TestEntity1.swift */; };
 		B5489F401CF5EEBC008B4978 /* TestEntity1.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F3D1CF5EEBC008B4978 /* TestEntity1.swift */; };
 		B5489F411CF5EEBC008B4978 /* TestEntity1.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5489F3D1CF5EEBC008B4978 /* TestEntity1.swift */; };
@@ -371,7 +365,6 @@
 		B563218B1BD65216006C9394 /* UnsafeDataTransaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EED1AFF846E0064E85B /* UnsafeDataTransaction.swift */; };
 		B563218C1BD65216006C9394 /* DataStack+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */; };
 		B563218D1BD65216006C9394 /* CoreStore+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */; };
-		B563218E1BD65216006C9394 /* SaveResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84EF21AFF846E0064E85B /* SaveResult.swift */; };
 		B563218F1BD65216006C9394 /* ImportableObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8C1B9AA97D007C5CBB /* ImportableObject.swift */; };
 		B56321901BD65216006C9394 /* ImportableUniqueObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F1DA8F1B9AA991007C5CBB /* ImportableUniqueObject.swift */; };
 		B56321911BD65216006C9394 /* BaseDataTransaction+Importing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E834B81B76311F001D3D50 /* BaseDataTransaction+Importing.swift */; };
@@ -414,10 +407,6 @@
 		B565079A1D3930D1000596DA /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B56507991D3930D1000596DA /* Foundation.framework */; };
 		B565079E1D3930ED000596DA /* CoreData.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B565079D1D3930ED000596DA /* CoreData.framework */; };
 		B56507A01D3930F5000596DA /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B565079F1D3930F5000596DA /* Foundation.framework */; };
-		B5677D3D1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
-		B5677D3F1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
-		B5677D401CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
-		B5677D411CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */; };
 		B56923C41EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56923C31EB823B4007C4DC9 /* NSEntityDescription+Migration.swift */; };
 		B56923C51EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56923C31EB823B4007C4DC9 /* NSEntityDescription+Migration.swift */; };
 		B56923C61EB823B4007C4DC9 /* NSEntityDescription+Migration.swift in Sources */ = {isa = PBXBuildFile; fileRef = B56923C31EB823B4007C4DC9 /* NSEntityDescription+Migration.swift */; };
@@ -477,6 +466,12 @@
 		B5831B7B1F34ACBA00A9F647 /* Transformable.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5831B791F34ACBA00A9F647 /* Transformable.swift */; };
 		B5831B7C1F34ACBA00A9F647 /* Transformable.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5831B791F34ACBA00A9F647 /* Transformable.swift */; };
 		B5831B7D1F34ACBA00A9F647 /* Transformable.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5831B791F34ACBA00A9F647 /* Transformable.swift */; };
+		B5831F4022126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */; };
+		B5831F4122126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */; };
+		B5831F4222126FED00D8604C /* KeyPathGenericBindings.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */; };
+		B5831F432212700400D8604C /* Where.Expression.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */; };
+		B5831F442212700500D8604C /* Where.Expression.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */; };
+		B5831F452212700500D8604C /* Where.Expression.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */; };
 		B58B22F51C93C1BA00521925 /* CoreStore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 2F03A53019C5C6DA005002A5 /* CoreStore.framework */; };
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 		B58D0C641EAA0C7E003EDD87 /* NSManagedObject+DynamicModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = B58D0C621EAA0C7E003EDD87 /* NSManagedObject+DynamicModel.swift */; };
@@ -497,10 +492,6 @@
 		B598514A1C90289E00C99590 /* NSPersistentStoreCoordinator+Setup.swift in Sources */ = {isa = PBXBuildFile; fileRef = B59AFF401C6593E400C0ABE2 /* NSPersistentStoreCoordinator+Setup.swift */; };
 		B598514B1C90289F00C99590 /* NSPersistentStoreCoordinator+Setup.swift in Sources */ = {isa = PBXBuildFile; fileRef = B59AFF401C6593E400C0ABE2 /* NSPersistentStoreCoordinator+Setup.swift */; };
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-		B59FA0AE1CCBAC95007C9BCA /* ICloudStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B59FA0AD1CCBAC95007C9BCA /* ICloudStore.swift */; };
-		B59FA0B01CCBACA7007C9BCA /* ICloudStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B59FA0AD1CCBAC95007C9BCA /* ICloudStore.swift */; };
-		B59FA0B11CCBACA7007C9BCA /* ICloudStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B59FA0AD1CCBAC95007C9BCA /* ICloudStore.swift */; };
-		B59FA0B21CCBACA8007C9BCA /* ICloudStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = B59FA0AD1CCBAC95007C9BCA /* ICloudStore.swift */; };
 		B5A1DAC81F111BFA003CF369 /* KeyPath+Querying.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5A1DAC71F111BFA003CF369 /* KeyPath+Querying.swift */; };
 		B5A1DAC91F111BFA003CF369 /* KeyPath+Querying.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5A1DAC71F111BFA003CF369 /* KeyPath+Querying.swift */; };
 		B5A1DACA1F111BFA003CF369 /* KeyPath+Querying.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5A1DAC71F111BFA003CF369 /* KeyPath+Querying.swift */; };
@@ -570,14 +561,12 @@
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+		B5DAFB4A2203E01D003FCCD0 /* KeyPathGenericBindings.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */; };
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@@ -659,6 +647,10 @@
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+		B5E8A72021C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
+		B5E8A72121C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
+		B5E8A72221C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
+		B5E8A72321C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
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@@ -783,6 +775,7 @@
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+		B524E78721CA20AC00BEB794 /* .jazzy.yaml */ = {isa = PBXFileReference; lastKnownFileType = text; path = .jazzy.yaml; sourceTree = SOURCE_ROOT; };
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@@ -791,8 +784,6 @@
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-		B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "CoreStoreFetchRequest+CoreStore.swift"; sourceTree = "<group>"; };
-		B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSSaveResult.swift; sourceTree = "<group>"; };
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@@ -815,6 +806,7 @@
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 		B546F9721C9C553300D5AC55 /* SetupResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SetupResult.swift; sourceTree = "<group>"; };
+		B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CoreStoreFetchRequest.swift; sourceTree = "<group>"; };
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@@ -845,7 +837,6 @@
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-		B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ICloudStoreObserver.swift; sourceTree = "<group>"; };
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@@ -855,7 +846,7 @@
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-		B56964D31B22FFAD0075EE4A /* DataStack+Migration.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; lineEnding = 0; path = "DataStack+Migration.swift"; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.swift; };
+		B56964D31B22FFAD0075EE4A /* DataStack+Migration.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; lineEnding = 0; path = "DataStack+Migration.swift"; sourceTree = "<group>"; };
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 		B57D27C11D0BC20100539C58 /* QueryTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = QueryTests.swift; sourceTree = "<group>"; };
@@ -868,10 +859,11 @@
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 		B596BBBA1DD5C39F001DCDD9 /* QueryableSource.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = QueryableSource.swift; sourceTree = "<group>"; };
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-		B59FA0AD1CCBAC95007C9BCA /* ICloudStore.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ICloudStore.swift; sourceTree = "<group>"; };
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 		B5A5F2651CAEC50F004AB9AF /* CSSelect.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSSelect.swift; sourceTree = "<group>"; };
+		B5A80DF42212C1AB006096AA /* Playground_macOS.playground */ = {isa = PBXFileReference; lastKnownFileType = file.playground; path = Playground_macOS.playground; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.swift; };
+		B5A80DF52212C1BC006096AA /* Playground_iOS.playground */ = {isa = PBXFileReference; lastKnownFileType = file.playground; path = Playground_iOS.playground; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.swift; };
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@@ -894,9 +886,10 @@
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-		B5D3F6441C887C0A00C7492A /* LegacySQLiteStore.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LegacySQLiteStore.swift; sourceTree = "<group>"; };
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 		B5D9C8F61B160ED200E64F0E /* CoreStore.podspec */ = {isa = PBXFileReference; explicitFileType = text.script.ruby; path = CoreStore.podspec; sourceTree = SOURCE_ROOT; };
+		B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Where.Expression.swift; sourceTree = "<group>"; };
+		B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyPathGenericBindings.swift; sourceTree = "<group>"; };
 		B5DBE2CC1C9914A900B5CEFA /* CSCoreStore.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSCoreStore.swift; sourceTree = "<group>"; };
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@@ -925,7 +918,6 @@
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 		B5E84EED1AFF846E0064E85B /* UnsafeDataTransaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UnsafeDataTransaction.swift; sourceTree = "<group>"; };
 		B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "CoreStore+Transaction.swift"; sourceTree = "<group>"; };
-		B5E84EF21AFF846E0064E85B /* SaveResult.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SaveResult.swift; sourceTree = "<group>"; };
 		B5E84EF31AFF846E0064E85B /* SynchronousDataTransaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SynchronousDataTransaction.swift; sourceTree = "<group>"; };
 		B5E84EFE1AFF847B0064E85B /* BaseDataTransaction+Querying.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "BaseDataTransaction+Querying.swift"; sourceTree = "<group>"; };
 		B5E84F001AFF847B0064E85B /* Tweak.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Tweak.swift; sourceTree = "<group>"; };
@@ -950,6 +942,7 @@
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+		B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "CoreStoreObject+Observing.swift"; sourceTree = "<group>"; };
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 		B5ECDBEB1CA6BF2000C7F112 /* CSFrom.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSFrom.swift; sourceTree = "<group>"; };
@@ -1040,6 +1033,8 @@
 		2F03A52619C5C6DA005002A5 = {
 			isa = PBXGroup;
 			children = (
+				B5A80DF52212C1BC006096AA /* Playground_iOS.playground */,
+				B5A80DF42212C1AB006096AA /* Playground_macOS.playground */,
 				2F291E3119C6D4D3007AF63F /* Frameworks */,
 				2F03A53219C5C6DA005002A5 /* Sources */,
 				2F03A53C19C5C6DA005002A5 /* CoreStoreTests */,
@@ -1082,6 +1077,7 @@
 				B5BDC91A1C202269008147CD /* Cartfile */,
 				B5D2D5A91F7558CB00A4DE67 /* .cocoapods.yml */,
 				B5BDC9271C2024F2008147CD /* .travis.yml */,
+				B524E78721CA20AC00BEB794 /* .jazzy.yaml */,
 				B5AD60CD1C90141E00F2B2E8 /* Package.swift */,
 			);
 			name = "Supporting Files";
@@ -1245,7 +1241,6 @@
 				B5E222291CA51B6E00BA2E95 /* CSUnsafeDataTransaction.swift */,
 				B5ECDC281CA81CC700C7F112 /* CSDataStack+Transaction.swift */,
 				B5ECDC2E1CA81CDC00C7F112 /* CSCoreStore+Transaction.swift */,
-				B529C2031CA4A2DB007E7EBD /* CSSaveResult.swift */,
 			);
 			name = Transactions;
 			sourceTree = "<group>";
@@ -1324,6 +1319,7 @@
 				B5A1DAC71F111BFA003CF369 /* KeyPath+Querying.swift */,
 				B5D339EB1E9495E500C880DE /* CoreStoreObject+Querying.swift */,
 				B5CA2B111F81DBFE004B1936 /* DynamicKeyPath.swift */,
+				B5DAFB492203E01D003FCCD0 /* KeyPathGenericBindings.swift */,
 			);
 			name = "KeyPath Utilities";
 			sourceTree = "<group>";
@@ -1443,7 +1439,6 @@
 				B5E84EEC1AFF846E0064E85B /* DataStack+Transaction.swift */,
 				B5E84EEE1AFF846E0064E85B /* CoreStore+Transaction.swift */,
 				B50392F81C478FF3009900CA /* NSManagedObject+Transaction.swift */,
-				B5E84EF21AFF846E0064E85B /* SaveResult.swift */,
 			);
 			name = Transactions;
 			sourceTree = "<group>";
@@ -1471,6 +1466,7 @@
 				B5E84F011AFF847B0064E85B /* From.swift */,
 				B5E84F031AFF847B0064E85B /* Select.swift */,
 				B5E84F051AFF847B0064E85B /* Where.swift */,
+				B5DAFB472203D9F8003FCCD0 /* Where.Expression.swift */,
 				B5E84F041AFF847B0064E85B /* OrderBy.swift */,
 				B5E84F021AFF847B0064E85B /* GroupBy.swift */,
 				B5E84F001AFF847B0064E85B /* Tweak.swift */,
@@ -1493,6 +1489,7 @@
 				B56007131B3F6C2800A9A8F9 /* SectionBy.swift */,
 				B5E84F1A1AFF84860064E85B /* DataStack+Observing.swift */,
 				B5E84F1B1AFF84860064E85B /* CoreStore+Observing.swift */,
+				B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */,
 				B5C976E21C6C9F6A00B1AF90 /* UnsafeDataTransaction+Observing.swift */,
 				B5E84F1C1AFF84860064E85B /* ObjectMonitor.swift */,
 				B5E84F1F1AFF84860064E85B /* ObjectObserver.swift */,
@@ -1520,8 +1517,8 @@
 			children = (
 				B5831B6F1F34AC3400A9F647 /* AttributeProtocol.swift */,
 				B5831B741F34AC7A00A9F647 /* RelationshipProtocol.swift */,
+				B5474D142227C08700B21FEC /* CoreStoreFetchRequest.swift */,
 				B5C976E61C6E3A5900B1AF90 /* CoreStoreFetchedResultsController.swift */,
-				B526613F1CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift */,
 				B53B275E1EE3B92E00E9B352 /* CoreStoreManagedObject.swift */,
 				B533C4DA1D7D4BFA001383CB /* DispatchQueue+CoreStore.swift */,
 				B51260921E9B28F100402229 /* EntityIdentifier.swift */,
@@ -1572,9 +1569,6 @@
 				B5FE4DA11C8481E100FA6A91 /* StorageInterface.swift */,
 				B5FE4DA61C84FB4400FA6A91 /* InMemoryStore.swift */,
 				B5FE4DAB1C85D44E00FA6A91 /* SQLiteStore.swift */,
-				B5D3F6441C887C0A00C7492A /* LegacySQLiteStore.swift */,
-				B59FA0AD1CCBAC95007C9BCA /* ICloudStore.swift */,
-				B5677D3C1CD3B1E400322BFC /* ICloudStoreObserver.swift */,
 			);
 			name = StorageInterfaces;
 			sourceTree = "<group>";
@@ -1754,7 +1748,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0930;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = "John Rommel Estropia";
 				TargetAttributes = {
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@@ -1791,6 +1785,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 				Base,
 			);
@@ -1875,17 +1870,16 @@
 				B5F1DA901B9AA991007C5CBB /* ImportableUniqueObject.swift in Sources */,
 				B51260891E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
 				B504D0D61B02362500B2BBB1 /* CoreStore+Setup.swift in Sources */,
-				B529C2041CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */,
 				B5D1E22C19FA9FBC003B2874 /* CoreStoreError.swift in Sources */,
 				B5E84F131AFF847B0064E85B /* Where.swift in Sources */,
 				B5D339D81E9489AB00C880DE /* CoreStoreObject.swift in Sources */,
-				B5D3F6451C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B56923FA1EB82956007C4DC9 /* CSXcodeDataModelSchema.swift in Sources */,
 				B55514EA1EED8BF900BAB888 /* From+Querying.swift in Sources */,
 				B596BBBB1DD5C39F001DCDD9 /* QueryableSource.swift in Sources */,
 				B5ECDBFF1CA80CBA00C7F112 /* CSWhere.swift in Sources */,
 				B5ECDC051CA8138100C7F112 /* CSOrderBy.swift in Sources */,
 				B5E1B5981CAA0C23007FD580 /* CSObjectObserver.swift in Sources */,
+				B5DAFB4A2203E01D003FCCD0 /* KeyPathGenericBindings.swift in Sources */,
 				B5519A5F1CA21954002BEF78 /* CSAsynchronousDataTransaction.swift in Sources */,
 				B52FD3AA1E3B3EF10001D919 /* NSManagedObject+Logging.swift in Sources */,
 				B52F74411E9B8724005F3DAC /* UnsafeDataModelSchema.swift in Sources */,
@@ -1916,7 +1910,6 @@
 				B56923F01EB827F6007C4DC9 /* XcodeSchemaMappingProvider.swift in Sources */,
 				B5E84F121AFF847B0064E85B /* OrderBy.swift in Sources */,
 				B546F9581C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
-				B5677D3D1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				B5E84F361AFF85470064E85B /* NSManagedObjectContext+Setup.swift in Sources */,
 				B5FAD6AE1B518DCB00714891 /* CoreStore+Migration.swift in Sources */,
 				B5E84EE71AFF84610064E85B /* CoreStore+Logging.swift in Sources */,
@@ -1925,11 +1918,11 @@
 				B56007111B3F6BD500A9A8F9 /* Into.swift in Sources */,
 				B5E84F111AFF847B0064E85B /* Select.swift in Sources */,
 				B51260931E9B28F100402229 /* EntityIdentifier.swift in Sources */,
+				B5DAFB482203D9F8003FCCD0 /* Where.Expression.swift in Sources */,
 				B5FE4DA21C8481E100FA6A91 /* StorageInterface.swift in Sources */,
 				B53FB9FE1CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B5DBE2D21C991B3E00B5CEFA /* CSDataStack.swift in Sources */,
 				B50392F91C478FF3009900CA /* NSManagedObject+Transaction.swift in Sources */,
-				B52661401CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B53FBA181CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				B5202CFA1C04688100DED140 /* NSFetchedResultsController+Convenience.swift in Sources */,
 				B5519A591CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
@@ -1966,7 +1959,6 @@
 				B5519A4A1CA1F4FB002BEF78 /* CSError.swift in Sources */,
 				B52F742F1E9B50D0005F3DAC /* SchemaHistory.swift in Sources */,
 				B5E84EF51AFF846E0064E85B /* BaseDataTransaction.swift in Sources */,
-				B5E84EFB1AFF846E0064E85B /* SaveResult.swift in Sources */,
 				B5D339EC1E9495E500C880DE /* CoreStoreObject+Querying.swift in Sources */,
 				B5E84F0F1AFF847B0064E85B /* From.swift in Sources */,
 				B5FAD6A91B50A4B400714891 /* Progress+Convenience.swift in Sources */,
@@ -1995,7 +1987,6 @@
 				B501FDDD1CA8D05000BE22EF /* CSSectionBy.swift in Sources */,
 				B538BA771D15B3E30003A766 /* CoreStoreBridge.m in Sources */,
 				B512607F1E97A18000402229 /* CoreStoreObject+Convenience.swift in Sources */,
-				B59FA0AE1CCBAC95007C9BCA /* ICloudStore.swift in Sources */,
 				B5E84EF81AFF846E0064E85B /* CoreStore+Transaction.swift in Sources */,
 				B5E84F301AFF849C0064E85B /* NSManagedObjectContext+CoreStore.swift in Sources */,
 				B5831B7A1F34ACBA00A9F647 /* Transformable.swift in Sources */,
@@ -2008,6 +1999,8 @@
 				B5A991EC1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5FE4DA71C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
 				B52F743D1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72021C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D152227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56923FF1EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CAE1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B5ECDBEC1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
@@ -2071,7 +2064,6 @@
 				82BA18A21C4BBD1D00A0916E /* CoreStoreError.swift in Sources */,
 				B512608A1E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
 				82BA18B21C4BBD3900A0916E /* ImportableObject.swift in Sources */,
-				B529C2061CA4A2DB007E7EBD /* CSSaveResult.swift in Sources */,
 				82BA18AE1C4BBD3100A0916E /* DataStack+Transaction.swift in Sources */,
 				82BA18AB1C4BBD3100A0916E /* AsynchronousDataTransaction.swift in Sources */,
 				B5D339D91E9489AB00C880DE /* CoreStoreObject.swift in Sources */,
@@ -2101,7 +2093,6 @@
 				B5831B761F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
 				B5E1B5AA1CAA49E2007FD580 /* CSDataStack+Migrating.swift in Sources */,
 				B5D339F21E94AF5800C880DE /* CoreStoreStrings.swift in Sources */,
-				B5D3F6461C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B5E1B59F1CAA2568007FD580 /* CSDataStack+Observing.swift in Sources */,
 				B5ECDC251CA81A3900C7F112 /* CSCoreStore+Querying.swift in Sources */,
 				B549F6741E56A92800FBAB2D /* CoreDataNativeType.swift in Sources */,
@@ -2112,14 +2103,14 @@
 				B56923F11EB827F6007C4DC9 /* XcodeSchemaMappingProvider.swift in Sources */,
 				82BA18A11C4BBD1D00A0916E /* CoreStore.swift in Sources */,
 				B546F9591C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
-				B5677D3F1CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				82BA18CF1C4BBD7100A0916E /* Functions.swift in Sources */,
 				82BA18A31C4BBD2200A0916E /* DataStack.swift in Sources */,
 				82BA18C81C4BBD5900A0916E /* MigrationChain.swift in Sources */,
 				B546F9741C9C553300D5AC55 /* SetupResult.swift in Sources */,
+				B5831F4022126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */,
 				B53CA9A31EF1EF1600E0F440 /* PartialObject.swift in Sources */,
-				82BA18B11C4BBD3100A0916E /* SaveResult.swift in Sources */,
 				82BA18DD1C4BBE1400A0916E /* NSFetchedResultsController+Convenience.swift in Sources */,
+				B5831F432212700400D8604C /* Where.Expression.swift in Sources */,
 				B51260941E9B28F100402229 /* EntityIdentifier.swift in Sources */,
 				B5FE4DA81C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
 				B53FBA001CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
@@ -2127,7 +2118,6 @@
 				82BA18B41C4BBD3900A0916E /* BaseDataTransaction+Importing.swift in Sources */,
 				B53FBA1A1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				82BA18CA1C4BBD5900A0916E /* MigrationResult.swift in Sources */,
-				B52661421CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B5519A5A1CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
 				B5ECDBE11CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
 				82BA18C11C4BBD5300A0916E /* CoreStore+Observing.swift in Sources */,
@@ -2188,7 +2178,6 @@
 				82BA18CB1C4BBD6400A0916E /* NSManagedObject+Convenience.swift in Sources */,
 				82BA18B51C4BBD3F00A0916E /* BaseDataTransaction+Querying.swift in Sources */,
 				B501FDDF1CA8D05000BE22EF /* CSSectionBy.swift in Sources */,
-				B59FA0B01CCBACA7007C9BCA /* ICloudStore.swift in Sources */,
 				B538BA781D15B3E30003A766 /* CoreStoreBridge.m in Sources */,
 				B51260801E97A18000402229 /* CoreStoreObject+Convenience.swift in Sources */,
 				82BA18D31C4BBD7100A0916E /* NSManagedObjectContext+CoreStore.swift in Sources */,
@@ -2204,6 +2193,8 @@
 				B5A991ED1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5ECDBEE1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
 				B52F743E1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72121C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D162227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56924001EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CAF1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				82BA18D61C4BBD7100A0916E /* NSManagedObjectContext+Transaction.swift in Sources */,
@@ -2262,7 +2253,6 @@
 				B5220E1E1D13080D009BC71E /* CSListMonitor.swift in Sources */,
 				B5DBE2D01C9914A900B5CEFA /* CSCoreStore.swift in Sources */,
 				B5CA2B0B1F7E5ACA004B1936 /* WhereClauseType.swift in Sources */,
-				B5677D411CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				B56923F81EB828BF007C4DC9 /* CSDynamicSchema.swift in Sources */,
 				B52DD1BE1BE1F94300949AFE /* Progress+Convenience.swift in Sources */,
 				B512608C1E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
@@ -2291,7 +2281,6 @@
 				B52DD1AB1BE1F93900949AFE /* From.swift in Sources */,
 				B546F95B1C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
 				B52DD1A11BE1F92C00949AFE /* DataStack+Transaction.swift in Sources */,
-				B5D3F6481C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B5220E1C1D130801009BC71E /* FetchedResultsControllerDelegate.swift in Sources */,
 				B52DD19E1BE1F92C00949AFE /* AsynchronousDataTransaction.swift in Sources */,
 				B5831B781F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
@@ -2313,9 +2302,11 @@
 				B52DD1961BE1F92500949AFE /* DataStack.swift in Sources */,
 				B5ECDBFD1CA804FD00C7F112 /* NSManagedObjectContext+ObjectiveC.swift in Sources */,
 				B52DD1BD1BE1F94300949AFE /* NSManagedObject+Convenience.swift in Sources */,
+				B5831F4222126FED00D8604C /* KeyPathGenericBindings.swift in Sources */,
 				B53CA9A51EF1EF1600E0F440 /* PartialObject.swift in Sources */,
 				B52DD1AD1BE1F93900949AFE /* Where.swift in Sources */,
 				B53FBA1C1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
+				B5831F452212700500D8604C /* Where.Expression.swift in Sources */,
 				B51260961E9B28F100402229 /* EntityIdentifier.swift in Sources */,
 				B5ECDBE31CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
 				B5ECDC031CA80CBA00C7F112 /* CSWhere.swift in Sources */,
@@ -2324,7 +2315,6 @@
 				B52DD1C71BE1F94600949AFE /* NSManagedObjectContext+Querying.swift in Sources */,
 				B52DD1C81BE1F94600949AFE /* NSManagedObjectContext+Setup.swift in Sources */,
 				B52DD1C31BE1F94600949AFE /* NotificationObserver.swift in Sources */,
-				B52661441CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B52DD1A81BE1F93200949AFE /* DataStack+Querying.swift in Sources */,
 				B5220E221D130818009BC71E /* CSSectionBy.swift in Sources */,
 				B52DD1BC1BE1F94000949AFE /* MigrationResult.swift in Sources */,
@@ -2345,7 +2335,6 @@
 				B52DD19C1BE1F92C00949AFE /* Into.swift in Sources */,
 				B5FE4DA51C8481E100FA6A91 /* StorageInterface.swift in Sources */,
 				B596BBB91DD5BC67001DCDD9 /* FetchableSource.swift in Sources */,
-				B529C2081CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */,
 				B5FE4DAA1C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
 				B52DD1AF1BE1F93900949AFE /* GroupBy.swift in Sources */,
 				B52DD1B01BE1F93900949AFE /* Tweak.swift in Sources */,
@@ -2356,7 +2345,6 @@
 				B52DD1BA1BE1F94000949AFE /* MigrationChain.swift in Sources */,
 				B50392FB1C479640009900CA /* NSManagedObject+Transaction.swift in Sources */,
 				B52F74321E9B50D0005F3DAC /* SchemaHistory.swift in Sources */,
-				B52DD1A31BE1F92C00949AFE /* SaveResult.swift in Sources */,
 				B5220E211D130816009BC71E /* CSObjectObserver.swift in Sources */,
 				B5D339EF1E9495E500C880DE /* CoreStoreObject+Querying.swift in Sources */,
 				B52DD19F1BE1F92C00949AFE /* SynchronousDataTransaction.swift in Sources */,
@@ -2366,7 +2354,6 @@
 				B5215CAC1FA4810300139E3A /* QueryChainBuilder.swift in Sources */,
 				B53FBA0F1CAB5E6500F0D40A /* CSCoreStore+Migrating.swift in Sources */,
 				B52F744D1E9B8740005F3DAC /* CoreStoreSchema.swift in Sources */,
-				B59FA0B21CCBACA8007C9BCA /* ICloudStore.swift in Sources */,
 				B52DD19A1BE1F92800949AFE /* CoreStore+Logging.swift in Sources */,
 				B52DD1A71BE1F93200949AFE /* BaseDataTransaction+Querying.swift in Sources */,
 				B546F96C1C9AF26D00D5AC55 /* CSInMemoryStore.swift in Sources */,
@@ -2400,6 +2387,8 @@
 				B5A991EF1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5220E201D130813009BC71E /* CSObjectMonitor.swift in Sources */,
 				B52F74401E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72321C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D182227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56924021EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CB11FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B5220E171D1306DF009BC71E /* UnsafeDataTransaction+Observing.swift in Sources */,
@@ -2463,7 +2452,6 @@
 				B56321801BD65216006C9394 /* CoreStoreError.swift in Sources */,
 				B512608B1E9B252B00402229 /* NSEntityDescription+DynamicModel.swift in Sources */,
 				B56321AD1BD6521C006C9394 /* MigrationManager.swift in Sources */,
-				B529C2071CA4A2DC007E7EBD /* CSSaveResult.swift in Sources */,
 				B563219D1BD65216006C9394 /* DataStack+Observing.swift in Sources */,
 				B56321961BD65216006C9394 /* From.swift in Sources */,
 				B5D339DA1E9489AB00C880DE /* CoreStoreObject.swift in Sources */,
@@ -2491,7 +2479,6 @@
 				B53FBA151CAB63CB00F0D40A /* Progress+ObjectiveC.swift in Sources */,
 				B5E1B5AB1CAA49E2007FD580 /* CSDataStack+Migrating.swift in Sources */,
 				B5831B771F34AC7A00A9F647 /* RelationshipProtocol.swift in Sources */,
-				B5D3F6471C887C0A00C7492A /* LegacySQLiteStore.swift in Sources */,
 				B5D339F31E94AF5800C880DE /* CoreStoreStrings.swift in Sources */,
 				B5E1B5A01CAA2568007FD580 /* CSDataStack+Observing.swift in Sources */,
 				B5ECDC261CA81A3900C7F112 /* CSCoreStore+Querying.swift in Sources */,
@@ -2503,20 +2490,20 @@
 				B56321911BD65216006C9394 /* BaseDataTransaction+Importing.swift in Sources */,
 				B56923F21EB827F6007C4DC9 /* XcodeSchemaMappingProvider.swift in Sources */,
 				B546F95A1C99B17400D5AC55 /* CSCoreStore+Setup.swift in Sources */,
-				B5677D401CD3B1E400322BFC /* ICloudStoreObserver.swift in Sources */,
 				B56321941BD65216006C9394 /* CoreStore+Querying.swift in Sources */,
 				B56321811BD65216006C9394 /* DataStack.swift in Sources */,
 				B56321A81BD65219006C9394 /* NSManagedObject+Convenience.swift in Sources */,
 				B546F9751C9C553300D5AC55 /* SetupResult.swift in Sources */,
 				B56321981BD65216006C9394 /* Where.swift in Sources */,
+				B5831F4122126FEC00D8604C /* KeyPathGenericBindings.swift in Sources */,
 				B53CA9A41EF1EF1600E0F440 /* PartialObject.swift in Sources */,
 				B5202CFD1C046E8400DED140 /* NSFetchedResultsController+Convenience.swift in Sources */,
 				B5FE4DA91C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
+				B5831F442212700500D8604C /* Where.Expression.swift in Sources */,
 				B51260951E9B28F100402229 /* EntityIdentifier.swift in Sources */,
 				B53FBA011CAB2D2F00F0D40A /* CSMigrationResult.swift in Sources */,
 				B5DBE2D41C991B3E00B5CEFA /* CSDataStack.swift in Sources */,
 				B50392FA1C47963F009900CA /* NSManagedObject+Transaction.swift in Sources */,
-				B52661431CADD585007B85D9 /* CoreStoreFetchRequest+CoreStore.swift in Sources */,
 				B53FBA1B1CAB63E200F0D40A /* NSManagedObject+ObjectiveC.swift in Sources */,
 				B5519A5B1CA2008C002BEF78 /* CSBaseDataTransaction.swift in Sources */,
 				B5ECDBE21CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */,
@@ -2556,7 +2543,6 @@
 				B56321991BD65216006C9394 /* OrderBy.swift in Sources */,
 				B5D339EE1E9495E500C880DE /* CoreStoreObject+Querying.swift in Sources */,
 				B56321A51BD65216006C9394 /* MigrationChain.swift in Sources */,
-				B563218E1BD65216006C9394 /* SaveResult.swift in Sources */,
 				B5E222261CA4E12600BA2E95 /* CSSynchronousDataTransaction.swift in Sources */,
 				B56321A21BD65216006C9394 /* ListObserver.swift in Sources */,
 				B5215CAB1FA4810300139E3A /* QueryChainBuilder.swift in Sources */,
@@ -2580,7 +2566,6 @@
 				B56321851BD65216006C9394 /* CoreStore+Logging.swift in Sources */,
 				B56321921BD65216006C9394 /* BaseDataTransaction+Querying.swift in Sources */,
 				B501FDE01CA8D05000BE22EF /* CSSectionBy.swift in Sources */,
-				B59FA0B11CCBACA7007C9BCA /* ICloudStore.swift in Sources */,
 				B538BA791D15B3E30003A766 /* CoreStoreBridge.m in Sources */,
 				B51260811E97A18000402229 /* CoreStoreObject+Convenience.swift in Sources */,
 				B56321B11BD6521C006C9394 /* NSManagedObjectContext+CoreStore.swift in Sources */,
@@ -2596,6 +2581,8 @@
 				B5A991EE1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
 				B5ECDBEF1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
 				B52F743F1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
+				B5E8A72221C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
+				B5474D172227C08700B21FEC /* CoreStoreFetchRequest.swift in Sources */,
 				B56924011EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
 				B5215CB01FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
 				B56321B41BD6521C006C9394 /* NSManagedObjectContext+Transaction.swift in Sources */,
@@ -2640,6 +2627,7 @@
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				APPLICATION_EXTENSION_API_ONLY = YES;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -2685,8 +2673,8 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = Sources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.11;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_SWIFT_FLAGS = "-D DEBUG";
@@ -2695,12 +2683,12 @@
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TVOS_DEPLOYMENT_TARGET = 9.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Debug;
 		};
@@ -2709,6 +2697,7 @@
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				APPLICATION_EXTENSION_API_ONLY = YES;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -2749,21 +2738,21 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				INFOPLIST_FILE = Sources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
-				MACOSX_DEPLOYMENT_TARGET = 10.11;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.CoreStore;
 				PRODUCT_NAME = CoreStore;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TVOS_DEPLOYMENT_TARGET = 9.0;
+				TVOS_DEPLOYMENT_TARGET = 10.0;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
-				WATCHOS_DEPLOYMENT_TARGET = 2.0;
+				WATCHOS_DEPLOYMENT_TARGET = 3.0;
 			};
 			name = Release;
 		};
@@ -2777,13 +2766,11 @@
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -2797,13 +2784,11 @@
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -2824,7 +2809,6 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -2840,7 +2824,6 @@
 				SDKROOT = iphoneos;
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -2861,7 +2844,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Debug;
@@ -2883,7 +2865,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Release;
@@ -2902,7 +2883,6 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Debug;
@@ -2921,7 +2901,6 @@
 				SDKROOT = appletvos;
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 3;
 			};
 			name = Release;
@@ -2942,12 +2921,10 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/Frameworks";
-				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -2968,12 +2945,10 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/Frameworks";
-				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -2994,7 +2969,6 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -3015,7 +2989,6 @@
 				SDKROOT = macosx;
 				SWIFT_OBJC_BRIDGING_HEADER = "CoreStoreTests/CoreStoreTests-Bridging-Header.h";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -3037,7 +3010,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 4;
 			};
 			name = Debug;
@@ -3061,7 +3033,6 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 4;
 			};
 			name = Release;
--- a/CoreStore.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/CoreStore.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
--- a/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
+++ b/CoreStore.xcodeproj/xcshareddata/xcschemes/CoreStore
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
--- a/CoreStore.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
+++ b/CoreStore.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict/>
+</plist>
--- a/CoreStoreDemo/CoreStoreDemo.xcodeproj/project.pbxproj
+++ b/CoreStoreDemo/CoreStoreDemo.xcodeproj/project.pbxproj
@@ -276,7 +276,7 @@
 			};
 			buildConfigurationList = B54AAD441AF4D26E00848AE0 /* Build configuration list for PBXProject "CoreStoreDemo" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
@@ -410,13 +410,13 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -460,11 +460,11 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -474,12 +474,10 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = CoreStoreDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.corestore.demo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -488,13 +486,11 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				INFOPLIST_FILE = CoreStoreDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.johnestropia.corestore.demo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
--- a/CoreStoreDemo/CoreStoreDemo.xcodeproj/xcshareddata/xcschemes/CoreStoreDemo.xcscheme
+++ b/CoreStoreDemo/CoreStoreDemo.xcodeproj/xcshareddata/xcschemes/CoreStoreDemo.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
--- a/CoreStoreDemo/CoreStoreDemo/AppDelegate.swift
+++ b/CoreStoreDemo/CoreStoreDemo/AppDelegate.swift
@@ -18,9 +18,8 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?

-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]? = nil) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
        
-        application.statusBarStyle = .lightContent
        return true
    }
 }
--- a/CoreStoreDemo/CoreStoreDemo/Base.lproj/Main.storyboard
+++ b/CoreStoreDemo/CoreStoreDemo/Base.lproj/Main.storyboard
@@ -1,14 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="Ni8-QF-XHB">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="Ni8-QF-XHB">
    <device id="retina4_7" orientation="portrait">
        <adaptation id="fullscreen"/>
    </device>
    <dependencies>
        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
-        <capability name="Aspect ratio constraints" minToolsVersion="5.1"/>
-        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
-        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <customFonts key="customFonts">
@@ -78,14 +75,14 @@
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Title" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="8b8-lM-Krq">
-                                            <rect key="frame" x="15" y="13" width="28.5" height="19"/>
+                                            <rect key="frame" x="16" y="13" width="28.5" height="19"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="16"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
                                        </label>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Subtitle" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="hR1-Zb-BOk">
-                                            <rect key="frame" x="308" y="13" width="52" height="19"/>
+                                            <rect key="frame" x="307" y="13" width="52" height="19"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="16"/>
                                            <color key="textColor" red="0.55686274509803924" green="0.55686274509803924" blue="0.57647058823529407" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -136,7 +133,7 @@
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <button opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="OQf-Bd-Zze">
-                                                    <rect key="frame" x="295" y="8" width="72" height="27.5"/>
+                                                    <rect key="frame" x="288" y="11" width="72" height="22"/>
                                                    <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                                    <inset key="contentEdgeInsets" minX="7" minY="0.0" maxX="7" maxY="0.0"/>
                                                    <state key="normal" title="mutate!"/>
@@ -145,7 +142,7 @@
                                                    </connections>
                                                </button>
                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VZk-6K-4ut">
-                                                    <rect key="frame" x="15" y="8" width="270" height="27.5"/>
+                                                    <rect key="frame" x="22" y="11" width="256" height="22"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Thin" family="Helvetica Neue" pointSize="17"/>
                                                    <color key="textColor" red="0.15542715787887573" green="0.2203737199306488" blue="0.2959403395652771" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
@@ -275,18 +272,18 @@
                                        <rect key="frame" x="0.0" y="35" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="AXm-KE-45G" id="9te-Wx-hkf">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Accounts" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="Q3n-Df-v1t">
-                                                    <rect key="frame" x="15" y="6" width="82" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="82" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Setting up multiple persistent store configurations" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="Hbn-cf-Y7m">
-                                                    <rect key="frame" x="15" y="30" width="263.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="263.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -302,18 +299,18 @@
                                        <rect key="frame" x="0.0" y="85" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="fsb-zw-8Ii" id="Upm-AO-Fw3">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Colors" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="vpt-cT-gMo">
-                                                    <rect key="frame" x="15" y="6" width="56" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="56" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Observing list changes and single object changes" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="ou9-TZ-8bf">
-                                                    <rect key="frame" x="15" y="30" width="260.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="260.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -329,18 +326,18 @@
                                        <rect key="frame" x="0.0" y="135" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="ekW-PJ-mbo" id="CYq-mg-PVS">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Placemarks" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="UbU-Kd-yrY">
-                                                    <rect key="frame" x="15" y="6" width="100.5" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="100.5" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Making changes with transactions" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="uP1-Jc-o9v">
-                                                    <rect key="frame" x="15" y="30" width="179" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="179" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -356,18 +353,18 @@
                                        <rect key="frame" x="0.0" y="185" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="ph1-8z-C1m" id="nNz-rd-ksg">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Time Zones" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="C8Y-0y-lEG">
-                                                    <rect key="frame" x="15" y="6" width="101.5" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="101.5" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Fetching objects and raw values" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="jZw-qE-0ws">
-                                                    <rect key="frame" x="15" y="30" width="168.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="168.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -383,18 +380,18 @@
                                        <rect key="frame" x="0.0" y="235" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="wyK-rk-3tI" id="fLd-KK-QcW">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Logger" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="ZfY-Aq-Ykq">
-                                                    <rect key="frame" x="15" y="6" width="61" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="61" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Implementing a custom logger" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="QzD-9b-k1j">
-                                                    <rect key="frame" x="15" y="30" width="159" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="159" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -410,18 +407,18 @@
                                        <rect key="frame" x="0.0" y="285" width="375" height="50"/>
                                        <autoresizingMask key="autoresizingMask"/>
                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="xTM-Cf-0if" id="DfO-BW-krd">
-                                            <rect key="frame" x="0.0" y="0.0" width="342" height="49.5"/>
+                                            <rect key="frame" x="0.0" y="0.0" width="341" height="49.5"/>
                                            <autoresizingMask key="autoresizingMask"/>
                                            <subviews>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Evolution" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="hSG-mG-YBw">
-                                                    <rect key="frame" x="15" y="6" width="78.5" height="24"/>
+                                                    <rect key="frame" x="16" y="6" width="78.5" height="24"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                    <nil key="highlightedColor"/>
                                                </label>
                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Migrating and de-migrating stores" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="X9P-TQ-LYh">
-                                                    <rect key="frame" x="15" y="30" width="179.5" height="13.5"/>
+                                                    <rect key="frame" x="16" y="30" width="179.5" height="13.5"/>
                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                                    <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -460,7 +457,7 @@
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <view contentMode="scaleToFill" verticalCompressionResistancePriority="250" translatesAutoresizingMaskIntoConstraints="NO" id="NhC-oM-bkd">
-                                <rect key="frame" x="16" y="89.5" width="343" height="50"/>
+                                <rect key="frame" x="16" y="69.5" width="343" height="70"/>
                                <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                <constraints>
                                    <constraint firstAttribute="height" relation="greaterThanOrEqual" id="TIX-qi-B34"/>
@@ -512,7 +509,7 @@
                                </connections>
                            </slider>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="p4O-tf-dgt">
-                                <rect key="frame" x="16" y="69" width="343" height="20.5"/>
+                                <rect key="frame" x="16" y="49" width="343" height="20.5"/>
                                <fontDescription key="fontDescription" type="boldSystem" pointSize="17"/>
                                <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                <nil key="highlightedColor"/>
@@ -623,7 +620,7 @@
                    <tabBarItem key="tabBarItem" title="Demo" image="second" id="3iQ-I2-4LW"/>
                    <toolbarItems/>
                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="00L-5k-Eno">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+                        <rect key="frame" x="0.0" y="20" width="375" height="44"/>
                        <autoresizingMask key="autoresizingMask"/>
                        <color key="tintColor" red="0.90744441747665405" green="0.9265514612197876" blue="0.93116652965545654" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <color key="barTintColor" red="0.15542715787887573" green="0.2203737199306488" blue="0.2959403395652771" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -653,18 +650,18 @@
                                <rect key="frame" x="0.0" y="22" width="375" height="44"/>
                                <autoresizingMask key="autoresizingMask"/>
                                <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="G3X-70-BCD" id="aT8-nz-i5l">
-                                    <rect key="frame" x="0.0" y="0.0" width="342" height="43.5"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="341" height="43.5"/>
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="uQX-PI-UWF">
-                                            <rect key="frame" x="8" y="8" width="27" height="27"/>
+                                            <rect key="frame" x="16" y="11" width="22" height="22"/>
                                            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <constraints>
                                                <constraint firstAttribute="width" secondItem="uQX-PI-UWF" secondAttribute="height" multiplier="1:1" id="9qA-iN-Neb"/>
                                            </constraints>
                                        </view>
                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="HJC-5w-lIN">
-                                            <rect key="frame" x="45" y="8" width="34.5" height="27"/>
+                                            <rect key="frame" x="48" y="11" width="34.5" height="22"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue" family="Helvetica Neue" pointSize="14"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
@@ -713,18 +710,18 @@
                                <rect key="frame" x="0.0" y="22" width="375" height="44"/>
                                <autoresizingMask key="autoresizingMask"/>
                                <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="zSO-3e-OVq" id="cHA-by-n4b">
-                                    <rect key="frame" x="0.0" y="0.0" width="342" height="43.5"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="341" height="43.5"/>
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="5uq-Yi-XwH">
-                                            <rect key="frame" x="8" y="8" width="27" height="27"/>
+                                            <rect key="frame" x="16" y="11" width="22" height="22"/>
                                            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <constraints>
                                                <constraint firstAttribute="width" secondItem="5uq-Yi-XwH" secondAttribute="height" multiplier="1:1" id="oOe-HC-VyN"/>
                                            </constraints>
                                        </view>
                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Zyu-PC-WmO">
-                                            <rect key="frame" x="45" y="8" width="34.5" height="27"/>
+                                            <rect key="frame" x="48" y="11" width="34.5" height="22"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue" family="Helvetica Neue" pointSize="14"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
@@ -767,7 +764,7 @@
                    <extendedEdge key="edgesForExtendedLayout" bottom="YES"/>
                    <toolbarItems/>
                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="6XA-6M-yvZ">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
                        <autoresizingMask key="autoresizingMask"/>
                        <color key="tintColor" red="0.68773996829986572" green="0.71417498588562012" blue="0.73246318101882935" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <color key="barTintColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -794,11 +791,11 @@
                        <viewControllerLayoutGuide type="bottom" id="RZg-hi-T8O"/>
                    </layoutGuides>
                    <view key="view" contentMode="scaleToFill" id="k4s-iL-Krh">
-                        <rect key="frame" x="0.0" y="64" width="375" height="603"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="603"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
-                            <mapView verifyAmbiguity="ignoreSizes" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" ambiguous="YES" mapType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="V2U-0R-Ts0">
-                                <rect key="frame" x="0.0" y="0.0" width="375" height="558"/>
+                            <mapView verifyAmbiguity="ignoreSizes" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" mapType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="V2U-0R-Ts0">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="603"/>
                                <connections>
                                    <outlet property="delegate" destination="jPl-fH-NlD" id="Sjn-YC-haS"/>
                                </connections>
@@ -888,7 +885,7 @@
                    <extendedEdge key="edgesForExtendedLayout" bottom="YES"/>
                    <toolbarItems/>
                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="wJo-mp-1pS">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
                        <autoresizingMask key="autoresizingMask"/>
                        <color key="tintColor" red="0.68773996829986572" green="0.71417498588562012" blue="0.73246318101882935" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <color key="barTintColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -1008,14 +1005,14 @@
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="name" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="RgX-yK-1L2">
-                                            <rect key="frame" x="15" y="11" width="48.5" height="24"/>
+                                            <rect key="frame" x="16" y="11" width="48.5" height="24"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
                                        </label>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="offset" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="QZ4-A2-x4h">
-                                            <rect key="frame" x="15" y="35" width="31" height="13.5"/>
+                                            <rect key="frame" x="16" y="35" width="31" height="13.5"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
@@ -1054,14 +1051,14 @@
                                    <autoresizingMask key="autoresizingMask"/>
                                    <subviews>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="name" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="Syt-QJ-KXg">
-                                            <rect key="frame" x="15" y="11" width="48.5" height="24"/>
+                                            <rect key="frame" x="16" y="11" width="48.5" height="24"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="20"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <nil key="highlightedColor"/>
                                        </label>
                                        <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="offset" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="yHS-dP-IKS">
-                                            <rect key="frame" x="15" y="35" width="31" height="13.5"/>
+                                            <rect key="frame" x="16" y="35" width="31" height="13.5"/>
                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                            <fontDescription key="fontDescription" type="system" pointSize="11"/>
                                            <color key="textColor" red="0.13079629838466644" green="0.184075728058815" blue="0.24594299495220184" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
--- a/Demo/FetchingAndQueryingDemoViewController.swift
+++ b/Demo/FetchingAndQueryingDemoViewController.swift
@@ -25,7 +25,7 @@ private struct Static {
        _ = try? dataStack.perform(
            synchronous: { (transaction) in
                
-                transaction.deleteAll(From<TimeZone>())
+                try transaction.deleteAll(From<TimeZone>())
                
                for name in NSTimeZone.knownTimeZoneNames {
                    
@@ -164,17 +164,17 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
            title: "All Time Zones",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .orderBy(.ascending(\.name))
-                )!
+                )
            }
        ),
        (
            title: "Time Zones in Asia",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(
                            format: "%K BEGINSWITH[c] %@",
@@ -182,14 +182,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            "Asia"
                        )
                        .orderBy(.ascending(\.secondsFromGMT))
-                )!
+                )
            }
        ),
        (
            title: "Time Zones in America and Europe",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(
                            format: "%K BEGINSWITH[c] %@ OR %K BEGINSWITH[c] %@",
@@ -199,14 +199,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            "Europe"
                        )
                        .orderBy(.ascending(\.secondsFromGMT))
-                )!
+                )
            }
        ),
        (
            title: "All Time Zones Except America",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(
                            format: "%K BEGINSWITH[c] %@",
@@ -214,18 +214,18 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            "America"
                        )
                        .orderBy(.ascending(\.secondsFromGMT))
-                    )!
+                    )
            }
        ),
        (
            title: "Time Zones with Summer Time",
            fetch: { () -> [TimeZone] in
                
-                return Static.timeZonesStack.fetchAll(
+                return try! Static.timeZonesStack.fetchAll(
                    From<TimeZone>()
                        .where(\.hasDaylightSavingTime == true)
                        .orderBy(.ascending(\.name))
-                )!
+                )
            }
        )
    ]
@@ -235,28 +235,28 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
            title: "Number of Time Zones",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryValue(
+                return try! Static.timeZonesStack.queryValue(
                    From<TimeZone>()
                        .select(NSNumber.self, .count(\.name))
-                )! as Any
+                )!
            }
        ),
        (
            title: "Abbreviation For Tokyo's Time Zone",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryValue(
+                return try! Static.timeZonesStack.queryValue(
                    From<TimeZone>()
                        .select(String.self, .attribute(\.abbreviation))
                        .where(format: "%K ENDSWITH[c] %@", #keyPath(TimeZone.name), "Tokyo")
-                )! as Any
+                )!
            }
        ),
        (
            title: "All Abbreviations",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryAttributes(
+                return try! Static.timeZonesStack.queryAttributes(
                    From<TimeZone>()
                        .select(
                            NSDictionary.self,
@@ -264,14 +264,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            .attribute(\.abbreviation)
                        )
                        .orderBy(.ascending(\.name))
-                )!
+                )
            }
        ),
        (
            title: "Number of Countries per Time Zone",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryAttributes(
+                return try! Static.timeZonesStack.queryAttributes(
                    From<TimeZone>()
                        .select(
                            NSDictionary.self,
@@ -283,14 +283,14 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            .ascending(\.secondsFromGMT),
                            .ascending(\.name)
                        )
-                )!
+                )
            }
        ),
        (
            title: "Number of Countries with Summer Time",
            query: { () -> Any in
                
-                return Static.timeZonesStack.queryAttributes(
+                return try! Static.timeZonesStack.queryAttributes(
                    From<TimeZone>()
                        .select(
                            NSDictionary.self,
@@ -302,7 +302,7 @@ class FetchingAndQueryingDemoViewController: UIViewController, UITableViewDataSo
                            .descending(\.hasDaylightSavingTime),
                            .ascending(\.name)
                        )
-                )!
+                )
            }
        )
    ]
--- a/Demo/FetchingResultsViewController.swift
+++ b/Demo/FetchingResultsViewController.swift
@@ -30,7 +30,7 @@ class FetchingResultsViewController: UITableViewController {
        super.viewDidLoad()
        
        self.tableView.estimatedRowHeight = 60
-        self.tableView.rowHeight = UITableViewAutomaticDimension
+        self.tableView.rowHeight = UITableView.automaticDimension
    }
    
    
--- a/Demo/QueryingResultsViewController.swift
+++ b/Demo/QueryingResultsViewController.swift
@@ -49,7 +49,7 @@ class QueryingResultsViewController: UITableViewController {
        super.viewDidLoad()
        
        self.tableView.estimatedRowHeight = 60
-        self.tableView.rowHeight = UITableViewAutomaticDimension
+        self.tableView.rowHeight = UITableView.automaticDimension
    }
    
    
--- a/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Contents.json
+++ b/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Contents.json
@@ -1,5 +1,15 @@
 {
  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
    {
      "idiom" : "iphone",
      "size" : "29x29",
@@ -32,6 +42,36 @@
      "filename" : "Icon-60@3x-1.png",
      "scale" : "3x"
    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
    {
      "size" : "76x76",
      "idiom" : "ipad",
@@ -44,6 +84,22 @@
      "filename" : "Icon-76@2x.png",
      "scale" : "2x"
    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Mask + Oval 1 + Oval 1 + Oval 1.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "car",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
    {
      "size" : "60x60",
      "idiom" : "car",
--- a/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Mask
+++ b/CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Mask
--- a/CoreStoreDemo/CoreStoreDemo/Info.plist
+++ b/CoreStoreDemo/CoreStoreDemo/Info.plist
@@ -17,7 +17,7 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>5.1.0</string>
+	<string>6.3.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
--- a/Demo/ListObserverDemoViewController.swift
+++ b/Demo/ListObserverDemoViewController.swift
@@ -122,6 +122,11 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
                target: self,
                action: #selector(self.addBarButtonItemTouched(_:))
            ),
+            UIBarButtonItem(
+                barButtonSystemItem: .refresh,
+                target: self,
+                action: #selector(self.shuffleBarButtonItemTouched(_:))
+            ),
            filterBarButton
        ]
        self.filterBarButton = filterBarButton
@@ -155,7 +160,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        
-        return ColorsDemo.palettes.numberOfObjectsInSection(section)
+        return ColorsDemo.palettes.numberOfObjects(in: section)
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
@@ -182,7 +187,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
        )
    }
    
-    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
+    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        
        switch editingStyle {
            
@@ -203,7 +208,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        
-        return ColorsDemo.palettes.sectionInfoAtIndex(section).name
+        return ColorsDemo.palettes.sectionInfo(at: section).name
    }
    
    
@@ -283,7 +288,7 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
        ColorsDemo.stack.perform(
            asynchronous: { (transaction) in
                
-                transaction.deleteAll(From<Palette>())
+                try transaction.deleteAll(From<Palette>())
            },
            completion: { _ in }
        )
@@ -305,9 +310,29 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
            completion: { _ in }
        )
    }
+
+    @IBAction private dynamic func shuffleBarButtonItemTouched(_ sender: AnyObject?) {
+
+        self.setTable(enabled: false)
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+
+                for palette in try transaction.fetchAll(From<Palette>()) {
+
+                    palette.hue .= Palette.randomHue()
+                    palette.colorName .= nil
+                }
+            },
+            completion: { _ in
+
+                self.setTable(enabled: true)
+            }
+        )
+    }
    
    private func setTable(enabled: Bool) {
-        
+
+        tableView.isUserInteractionEnabled = enabled
        UIView.animate(
            withDuration: 0.2,
            delay: 0,
@@ -317,7 +342,6 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
                if let tableView = self.tableView {
                    
                    tableView.alpha = enabled ? 1.0 : 0.5
-                    tableView.isUserInteractionEnabled = enabled
                }
            },
            completion: nil
--- a/Demo/ObjectObserverDemoViewController.swift
+++ b/Demo/ObjectObserverDemoViewController.swift
@@ -50,7 +50,7 @@ class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
    
    required init?(coder aDecoder: NSCoder) {
        
-        if let palette = ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue))) {
+        if let palette = try! ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue))) {
            
            self.monitor = ColorsDemo.stack.monitorObject(palette)
        }
@@ -64,7 +64,7 @@ class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
                }
            )
            
-            let palette = ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue)))!
+            let palette = try! ColorsDemo.stack.fetchOne(From<Palette>().orderBy(.ascending(\.hue)))!
            self.monitor = ColorsDemo.stack.monitorObject(palette)
        }
        
--- a/CoreStoreDemo/CoreStoreDemo/List
+++ b/CoreStoreDemo/CoreStoreDemo/List
@@ -25,6 +25,11 @@ final class Palette: CoreStoreObject {
        isTransient: true,
        customGetter: Palette.getColorName
    )
+
+    static func randomHue() -> Int {
+
+        return Int(arc4random_uniform(360))
+    }
    
    private static func getColorName(_ partialObject: PartialObject<Palette>) -> String? {
        
@@ -71,7 +76,7 @@ extension Palette {
    
    func setInitialValues(in transaction: BaseDataTransaction) {
        
-        self.hue .= Int(arc4random_uniform(360))
+        self.hue .= Palette.randomHue()
        self.saturation .= Float(1.0)
        self.brightness .= Float(arc4random_uniform(70) + 30) / 100.0
    }
--- a/Demo/CustomLoggerViewController.swift
+++ b/Demo/CustomLoggerViewController.swift
@@ -16,11 +16,6 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
    
    // MARK: NSObject
    
-    deinit {
-        
-        CoreStore.logger = DefaultLogger()
-    }
-    
    let dataStack = DataStack()
    
    // MARK: UIViewController
@@ -30,13 +25,14 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
        super.viewDidLoad()
        
        try! self.dataStack.addStorageAndWait(SQLiteStore(fileName: "emptyStore.sqlite"))
-        CoreStore.logger = self
    }
    
    override func viewDidAppear(_ animated: Bool) {
        
        super.viewDidAppear(animated)
-        
+
+        CoreStore.logger = self
+
        let alert = UIAlertController(
            title: "Logger Demo",
            message: "This demo shows how to plug-in any logging framework to CoreStore.\n\nThe view controller implements CoreStoreLogger and appends all logs to the text view.",
@@ -46,6 +42,13 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
        self.present(alert, animated: true, completion: nil)
    }

+    override func viewDidDisappear(_ animated: Bool) {
+
+        super.viewDidDisappear(animated)
+
+        CoreStore.logger = DefaultLogger()
+    }
+
    
    // MARK: CoreStoreLogger
    
@@ -113,7 +116,7 @@ class CustomLoggerViewController: UIViewController, CoreStoreLogger {
        case 2?:
            DispatchQueue.global(qos: .background).async {
                
-                _ = self.dataStack.fetchOne(From<Place>())
+                _ = try! self.dataStack.fetchOne(From<Place>())
            }
            
        default:
--- a/Demo/MigrationsDemoViewController.swift
+++ b/Demo/MigrationsDemoViewController.swift
@@ -79,7 +79,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
    func listMonitorDidChange(_ monitor: ListMonitor<NSManagedObject>) {
        
        if self.lastSelectedIndexPath == nil,
-            let numberOfObjectsInSection = self.listMonitor?.numberOfObjectsInSection(0),
+            let numberOfObjectsInSection = self.listMonitor?.numberOfObjects(in: 0),
            numberOfObjectsInSection > 0 {
            
            self.tableView?.reloadData()
@@ -100,7 +100,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
    
    @objc dynamic func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        
-        return self.listMonitor?.numberOfObjectsInSection(0) ?? 0
+        return self.listMonitor?.numberOfObjects(in: 0) ?? 0
    }
    
    @objc dynamic func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
@@ -286,7 +286,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
                
                self.set(dataStack: dataStack, model: model, scrollToSelection: true)
                
-                let count = dataStack.queryValue(
+                let count = try! dataStack.queryValue(
                    From<NSManagedObject>(model.entityType)
                        .select(Int.self, .count(#keyPath(OrganismV1.dna))))!
                if count > 0 {
@@ -360,7 +360,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
        if let dataStack = dataStack, let model = model {
            
            self.segmentedControl?.selectedSegmentIndex = self.models
-                .index(
+                .firstIndex(
                    where: { (arg) -> Bool in
                        
                        let (_, _, schemaHistory) = arg
@@ -378,7 +378,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
            
            if self.lastSelectedIndexPath == nil  {
                
-                if listMonitor.numberOfObjectsInSection(0) > 0 {
+                if listMonitor.numberOfObjects(in: 0) > 0 {
                    
                    self.setSelectedIndexPath(IndexPath(row: 0, section: 0), scrollToSelection: true)
                }
@@ -386,7 +386,7 @@ class MigrationsDemoViewController: UIViewController, ListObserver, UITableViewD
        }
        else {
           
-            self.segmentedControl?.selectedSegmentIndex = UISegmentedControlNoSegment
+            self.segmentedControl?.selectedSegmentIndex = UISegmentedControl.noSegment
            self._listMonitor = nil
            self._dataStack = nil
        }
--- a/Demo/StackSetupDemoViewController.swift
+++ b/Demo/StackSetupDemoViewController.swift
@@ -36,7 +36,7 @@ private struct Static {
        _ = try? dataStack.perform(
            synchronous: { (transaction) in
                
-                transaction.deleteAll(From<UserAccount>())
+                try transaction.deleteAll(From<UserAccount>())
                
                let account1 = transaction.create(Into<MaleAccount>(maleConfiguration))
                account1.accountType = "Facebook"
@@ -74,7 +74,7 @@ private struct Static {
        _ = try? dataStack.perform(
            synchronous: { (transaction) in
                
-                transaction.deleteAll(From<UserAccount>())
+                try transaction.deleteAll(From<UserAccount>())
                
                let account1 = transaction.create(Into<MaleAccount>(maleConfiguration))
                account1.accountType = "Twitter"
@@ -99,8 +99,8 @@ private struct Static {
 class StackSetupDemoViewController: UITableViewController {
    
    let accounts = [
-        Static.facebookStack.fetchAll(From(UserAccount.self)) ?? [],
-        Static.twitterStack.fetchAll(From(UserAccount.self)) ?? []
+        try! Static.facebookStack.fetchAll(From<UserAccount>()),
+        try! Static.twitterStack.fetchAll(From<UserAccount>())
    ]
    
    
--- a/Demo/TransactionsDemoViewController.swift
+++ b/Demo/TransactionsDemoViewController.swift
@@ -26,7 +26,7 @@ private struct Static {
            )
        )
        
-        var place = CoreStore.fetchOne(From<Place>())
+        var place = try! CoreStore.fetchOne(From<Place>())
        if place == nil {
            
            _ = try? CoreStore.perform(
@@ -36,7 +36,7 @@ private struct Static {
                    place.setInitialValues()
                }
            )
-            place = CoreStore.fetchOne(From<Place>())
+            place = try! CoreStore.fetchOne(From<Place>())
        }
        
        return CoreStore.monitorObject(place!)
--- a/CoreStoreTests/BaseTests/BaseTestCase.swift
+++ b/CoreStoreTests/BaseTests/BaseTestCase.swift
@@ -36,8 +36,7 @@ class BaseTestCase: XCTestCase {
    // MARK: Internal
    
    @nonobjc
-    @discardableResult
-    func prepareStack<T>(configurations: [ModelConfiguration] = [nil], _ closure: (_ dataStack: DataStack) -> T) -> T {
+    func prepareStack(configurations: [ModelConfiguration] = [nil], _ closure: (_ dataStack: DataStack) throws -> Void) {
        
        let stack = DataStack(
            xcodeModelName: "Model",
@@ -57,16 +56,16 @@ class BaseTestCase: XCTestCase {
                    )
                )
            }
+            try closure(stack)
        }
        catch let error as NSError {
            
            XCTFail(error.coreStoreDumpString)
        }
-        return closure(stack)
    }
    
    @nonobjc
-    func expectLogger<T>(_ expectations: [TestLogger.Expectation], closure: () -> T) -> T {
+    func expectLogger<T>(_ expectations: [TestLogger.Expectation], closure: () throws -> T) rethrows -> T {
        
        CoreStore.logger = TestLogger(self.prepareLoggerExpectations(expectations))
        defer {
@@ -74,7 +73,7 @@ class BaseTestCase: XCTestCase {
            self.checkExpectationsImmediately()
            CoreStore.logger = TestLogger([:])
        }
-        return closure()
+        return try closure()
    }
    
    @nonobjc
@@ -82,6 +81,33 @@ class BaseTestCase: XCTestCase {
        
        CoreStore.logger = TestLogger(expectations)
    }
+
+    @nonobjc
+    func expectError<T>(code: CoreStoreErrorCode, closure: () throws -> T) {
+
+        CoreStore.logger = TestLogger(self.prepareLoggerExpectations([.logError]))
+        defer {
+
+            self.checkExpectationsImmediately()
+            CoreStore.logger = TestLogger([:])
+        }
+        do {
+
+            _ = try closure()
+        }
+        catch let error as CoreStoreError {
+
+            if error.errorCode == code.rawValue {
+
+                return
+            }
+            XCTFail("Expected error code \(code) different from actual error: \((error as NSError).coreStoreDumpString)")
+        }
+        catch {
+
+            XCTFail("Error not wrapped as \(cs_typeName(CoreStoreError.self)): \((error as NSError).coreStoreDumpString)")
+        }
+    }
    
    @nonobjc
    func prepareLoggerExpectations(_ expectations: [TestLogger.Expectation]) -> [TestLogger.Expectation: XCTestExpectation] {
--- a/CoreStoreTests/DynamicModelTests.swift
+++ b/CoreStoreTests/DynamicModelTests.swift
@@ -30,9 +30,10 @@ import CoreStore

 #if os(macOS)
    typealias Color = NSColor
+
 #else
-    
    typealias Color = UIColor
+
 #endif

 class Animal: CoreStoreObject {
@@ -70,8 +71,13 @@ class Person: CoreStoreObject {
        customGetter: Person.getDisplayName(_:),
        affectedByKeyPaths: Person.keyPathsAffectingDisplayName()
    )
+
+    let spouse = Relationship.ToOne<Person>("spouse")
    
    let pets = Relationship.ToManyUnordered<Animal>("pets", inverse: { $0.master })
+
+    private let _spouse = Relationship.ToOne<Person>("_spouseInverse", inverse: { $0.spouse })
+
    
    private static func setTitle(_ partialObject: PartialObject<Person>, _ newValue: String) {
        
@@ -126,7 +132,7 @@ class DynamicModelTests: BaseTestDataTestCase {
                versionLock: [
                    "Animal": [0x1b59d511019695cf, 0xdeb97e86c5eff179, 0x1cfd80745646cb3, 0x4ff99416175b5b9a],
                    "Dog": [0xe3f0afeb109b283a, 0x29998d292938eb61, 0x6aab788333cfc2a3, 0x492ff1d295910ea7],
-                    "Person": [0x66d8bbfd8b21561f, 0xcecec69ecae3570f, 0xc4b73d71256214ef, 0x89b99bfe3e013e8b]
+                    "Person": [0x2831cf046084d96d, 0xbe19b13ace54641, 0x635a082728b0f6f0, 0x3d4ef2dd4b74a87c]
                ]
            )
        )
@@ -134,7 +140,7 @@ class DynamicModelTests: BaseTestDataTestCase {
            
            let k1 = String(keyPath: \Animal.species)
            XCTAssertEqual(k1, "species")
-            
+
            let k2 = String(keyPath: \Dog.species)
            XCTAssertEqual(k2, "species")
            
@@ -143,6 +149,9 @@ class DynamicModelTests: BaseTestDataTestCase {
            
            let updateDone = self.expectation(description: "update-done")
            let fetchDone = self.expectation(description: "fetch-done")
+            let willSetPriorObserverDone = self.expectation(description: "willSet-observe-prior-done")
+            let willSetNotPriorObserverDone = self.expectation(description: "willSet-observe-notPrior-done")
+            let didSetObserverDone = self.expectation(description: "didSet-observe-done")
            stack.perform(
                asynchronous: { (transaction) in
                    
@@ -160,9 +169,42 @@ class DynamicModelTests: BaseTestDataTestCase {
                    XCTAssertEqual(dog.species.value, "Swift")
                    XCTAssertEqual(dog.nickname.value, nil)
                    XCTAssertEqual(dog.age.value, 1)
+
+                    let didSetObserver = dog.species.observe(options: [.new, .old]) { (object, change) in
+
+                        XCTAssertEqual(object, dog)
+                        XCTAssertEqual(change.kind, .setting)
+                        XCTAssertEqual(change.newValue, "Dog")
+                        XCTAssertEqual(change.oldValue, "Swift")
+                        XCTAssertFalse(change.isPrior)
+                        XCTAssertEqual(object.species.value, "Dog")
+                        didSetObserverDone.fulfill()
+                    }
+                    let willSetObserver = dog.species.observe(options: [.new, .old, .prior]) { (object, change) in
+
+                        XCTAssertEqual(object, dog)
+                        XCTAssertEqual(change.kind, .setting)
+                        XCTAssertEqual(change.oldValue, "Swift")
+
+                        if change.isPrior {
+
+                            XCTAssertNil(change.newValue)
+                            XCTAssertEqual(object.species.value, "Swift")
+                            willSetPriorObserverDone.fulfill()
+                        }
+                        else {
+
+                            XCTAssertEqual(change.newValue, "Dog")
+                            XCTAssertEqual(object.species.value, "Dog")
+                            willSetNotPriorObserverDone.fulfill()
+                        }
+                    }
                    
                    dog.species .= "Dog"
                    XCTAssertEqual(dog.species.value, "Dog")
+
+                    didSetObserver.invalidate()
+                    willSetObserver.invalidate()
                    
                    dog.nickname .= "Spot"
                    XCTAssertEqual(dog.nickname.value, "Spot")
@@ -212,51 +254,54 @@ class DynamicModelTests: BaseTestDataTestCase {
                    let p1 = Where<Animal>({ $0.species == "Sparrow" })
                    XCTAssertEqual(p1.predicate, NSPredicate(format: "%K == %@", "species", "Sparrow"))
                    
-                    let bird = transaction.fetchOne(From<Animal>(), p1)
+                    let bird = try transaction.fetchOne(From<Animal>(), p1)
                    XCTAssertNotNil(bird)
                    XCTAssertEqual(bird!.species.value, "Sparrow")
                    
                    let p2 = Where<Dog>({ $0.nickname == "Spot" })
                    XCTAssertEqual(p2.predicate, NSPredicate(format: "%K == %@", "nickname", "Spot"))
                    
-                    let dog = transaction.fetchOne(From<Dog>().where(\.nickname == "Spot"))
+                    let dog = try transaction.fetchOne(From<Dog>().where(\.nickname == "Spot"))
                    XCTAssertNotNil(dog)
                    XCTAssertEqual(dog!.nickname.value, "Spot")
                    XCTAssertEqual(dog!.species.value, "Dog")
                    
-                    let person = transaction.fetchOne(From<Person>())
+                    let person = try transaction.fetchOne(From<Person>())
                    XCTAssertNotNil(person)
                    XCTAssertEqual(person!.pets.value.first, dog)
                    
                    let p3 = Where<Dog>({ $0.age == 10 })
                    XCTAssertEqual(p3.predicate, NSPredicate(format: "%K == %d", "age", 10))
+
+                    let totalAge = try transaction.queryValue(From<Dog>().select(Int.self, .sum(\Dog.age)))
+                    XCTAssertEqual(totalAge, 1)
                    
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>()
-                            .where(\Animal.species == "Dog" && \.age == 10)
+                            .where(\Animal.species == "Dog" && \Dog.age == 10)
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>()
-                            .where(\.age == 10 && \Animal.species == "Dog")
+                            .where(\Dog.age == 10 && \Animal.species == "Dog")
                            .orderBy(.ascending({ $0.species }))
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.age > 10 && $0.age <= 15 })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.species == "Dog" && $0.age == 10 })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.age == 10 && $0.species == "Dog" })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        Where<Dog>({ $0.age > 10 && $0.age <= 15 })
                    )
-                    _ = transaction.fetchAll(
+                    _ = try transaction.fetchAll(
                        From<Dog>(),
                        (\Dog.age > 10 && \Dog.age <= 15)
                    )
--- a/CoreStoreTests/FetchTests.swift
+++ b/CoreStoreTests/FetchTests.swift
--- a/CoreStoreTests/FromTests.swift
+++ b/CoreStoreTests/FromTests.swift
@@ -74,33 +74,31 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                try from.applyToFetchRequest(request, context: dataStack.mainContext)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
            }
            do {
                
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
        }
@@ -115,102 +113,98 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
-                
+
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
        }
@@ -225,99 +219,96 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(Set(affectedConfigurations), ["PF_DEFAULT_CONFIGURATION_NAME", "Config1"] as Set)
            }
            do {
                
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["PF_DEFAULT_CONFIGURATION_NAME"])
            }
            do {
                
                let from = From<TestEntity2>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
        }
@@ -332,96 +323,94 @@ final class FromTests: BaseTestCase {
                
                let from = From<TestEntity1>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config1"])
            }
            do {
                
                let from = From<TestEntity1>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>()
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config2"])
            }
            do {
                
                let from = From<TestEntity2>("Config1")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = self.expectLogger([.logWarning]) {
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                self.expectError(code: .persistentStoreNotFound) {
                    
-                    from.applyToFetchRequest(request, context: dataStack.mainContext)
+                    try from.applyToFetchRequest(request, context: dataStack.mainContext)
                }
-                XCTAssertFalse(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertTrue(affectedConfigurations.isEmpty)
            }
            do {
                
                let from = From<TestEntity2>("Config2")
                
-                let request = CoreStoreFetchRequest()
-                let storesFound = from.applyToFetchRequest(request, context: dataStack.mainContext)
-                XCTAssertTrue(storesFound)
+                let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+                let storesFound: Void? = try? from.applyToFetchRequest(request, context: dataStack.mainContext)
+                XCTAssertNotNil(storesFound)
                XCTAssertNotNil(request.entity)
-                XCTAssertNotNil(request.safeAffectedStores)
+                XCTAssertNotNil(request.safeAffectedStores())
                
                XCTAssert(from.entityClass == NSClassFromString(request.entity!.managedObjectClassName))
                
-                let affectedConfigurations = request.safeAffectedStores!.map { $0.configurationName }
+                let affectedConfigurations = request.safeAffectedStores()?.map { $0.configurationName } ?? []
                XCTAssertEqual(affectedConfigurations, ["Config2"])
            }
        }
--- a/CoreStoreTests/GroupByTests.swift
+++ b/CoreStoreTests/GroupByTests.swift
@@ -68,8 +68,8 @@ final class GroupByTests: BaseTestCase {
            
            let groupBy = GroupBy<NSManagedObject>(#keyPath(TestEntity1.testString))
            
-            let request = CoreStoreFetchRequest()
-            _ = From<TestEntity1>().applyToFetchRequest(request, context: dataStack.mainContext)
+            let request = CoreStoreFetchRequest<NSFetchRequestResult>()
+            try From<TestEntity1>().applyToFetchRequest(request, context: dataStack.mainContext)
            groupBy.applyToFetchRequest(request)
            
            XCTAssertNotNil(request.propertiesToGroupBy)
--- a/CoreStoreTests/ImportTests.swift
+++ b/CoreStoreTests/ImportTests.swift
@@ -95,7 +95,7 @@ class ImportTests: BaseTestDataTestCase {
                            ]
                        )
                        XCTAssertNil(object)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 0)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 0)
                    }
                )
            }
@@ -103,7 +103,7 @@ class ImportTests: BaseTestDataTestCase {
                
                XCTFail()
            }
-            XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
+            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
        }
    }
    
@@ -137,9 +137,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestInsertError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>())
+                            let object = try transaction.fetchOne(From<TestEntity1>())
                            XCTAssertNotNil(object)
                            XCTAssertNil(object?.testEntityID)
                            XCTAssertNil(object?.testBoolean)
@@ -182,7 +182,7 @@ class ImportTests: BaseTestDataTestCase {
                            ]
                        )
                        XCTAssertNotNil(object)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        XCTAssertNil(object?.testEntityID)
                        XCTAssertEqual(object?.testBoolean, NSNumber(value: true))
                        XCTAssertEqual(object?.testNumber, NSNumber(value: 1))
@@ -202,7 +202,7 @@ class ImportTests: BaseTestDataTestCase {
                                #keyPath(TestEntity1.testDate): self.dateFormatter.date(from: "2000-01-02T00:00:00Z")!
                            ]
                        )
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        XCTAssertNil(object?.testEntityID)
                        XCTAssertEqual(object?.testBoolean, NSNumber(value: false))
                        XCTAssertEqual(object?.testNumber, NSNumber(value: 2))
@@ -254,7 +254,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, 1)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        
                        let object = objects[0]
                        let dictionary = sourceArray[1]
@@ -316,9 +316,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestInsertError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>())
+                            let object = try transaction.fetchOne(From<TestEntity1>())
                            XCTAssertNotNil(object)
                            XCTAssertNil(object?.testEntityID)
                            XCTAssertNil(object?.testBoolean)
@@ -372,7 +372,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, sourceArray.count)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 2)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 2)
                        
                        for i in 0 ..< sourceArray.count {
                            
@@ -424,7 +424,7 @@ class ImportTests: BaseTestDataTestCase {
                                ]
                            )
                            XCTAssertNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                        }
                        do {
                            
@@ -442,20 +442,19 @@ class ImportTests: BaseTestDataTestCase {
                                ]
                            )
                            XCTAssertNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
-                            XCTAssertEqual(existingObject?.testEntityID, NSNumber(value: 105))
-                            XCTAssertEqual(existingObject?.testBoolean, NSNumber(value: true))
-                            XCTAssertEqual(existingObject?.testNumber, NSNumber(value: 5))
-                            XCTAssertEqual(existingObject?.testDecimal, NSDecimalNumber(string: "5"))
-                            XCTAssertEqual(existingObject?.testString, "nil:TestEntity1:5")
-                            XCTAssertEqual(existingObject?.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
-                            XCTAssertEqual(existingObject?.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
+                            let existingObject = existingObjects[0]
+                            XCTAssertEqual(existingObject.testEntityID, NSNumber(value: 105))
+                            XCTAssertEqual(existingObject.testBoolean, NSNumber(value: true))
+                            XCTAssertEqual(existingObject.testNumber, NSNumber(value: 5))
+                            XCTAssertEqual(existingObject.testDecimal, NSDecimalNumber(string: "5"))
+                            XCTAssertEqual(existingObject.testString, "nil:TestEntity1:5")
+                            XCTAssertEqual(existingObject.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
+                            XCTAssertEqual(existingObject.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
                        }
                    }
                )
@@ -504,7 +503,7 @@ class ImportTests: BaseTestDataTestCase {
                        )
                        
                        XCTAssertEqual(objects.count, 1)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                        
                        let object = objects[0]
                        let dictionary = sourceArray[1]
@@ -618,9 +617,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestInsertError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
+                            let object = try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
                            XCTAssertNotNil(object)
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertNil(object?.testBoolean)
@@ -657,21 +656,19 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestUpdateError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
-                            XCTAssertNotNil(existingObject)
-                            XCTAssertEqual(existingObject?.testEntityID, NSNumber(value: 105))
-                            XCTAssertEqual(existingObject?.testBoolean, NSNumber(value: true))
-                            XCTAssertEqual(existingObject?.testNumber, NSNumber(value: 5))
-                            XCTAssertEqual(existingObject?.testDecimal, NSDecimalNumber(string: "5"))
-                            XCTAssertEqual(existingObject?.testString, "nil:TestEntity1:5")
-                            XCTAssertEqual(existingObject?.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
-                            XCTAssertEqual(existingObject?.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
+                            let existingObject = existingObjects[0]
+                            XCTAssertEqual(existingObject.testEntityID, NSNumber(value: 105))
+                            XCTAssertEqual(existingObject.testBoolean, NSNumber(value: true))
+                            XCTAssertEqual(existingObject.testNumber, NSNumber(value: 5))
+                            XCTAssertEqual(existingObject.testDecimal, NSDecimalNumber(string: "5"))
+                            XCTAssertEqual(existingObject.testString, "nil:TestEntity1:5")
+                            XCTAssertEqual(existingObject.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
+                            XCTAssertEqual(existingObject.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
                        }
                        self.checkExpectationsImmediately()
                    }
@@ -710,7 +707,7 @@ class ImportTests: BaseTestDataTestCase {
                                ]
                            )
                            XCTAssertNotNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertEqual(object?.testBoolean, NSNumber(value: true))
@@ -735,7 +732,7 @@ class ImportTests: BaseTestDataTestCase {
                                    ]
                            )
                            XCTAssertNotNil(object)
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                            
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertEqual(object?.testBoolean, NSNumber(value: false))
@@ -745,11 +742,10 @@ class ImportTests: BaseTestDataTestCase {
                            XCTAssertEqual(object?.testData, ("nil:TestEntity1:7" as NSString).data(using: String.Encoding.utf8.rawValue)!)
                            XCTAssertEqual(object?.testDate, self.dateFormatter.date(from: "2000-01-07T00:00:00Z")!)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
+                            let existingObject = existingObjects[0]
                            XCTAssertEqual(existingObject, object)
                        }
                    }
@@ -799,7 +795,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, 1)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                        
                        let object = objects[0]
                        let dictionary = sourceArray[1]
@@ -864,10 +860,10 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestIDError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                            
-                            XCTAssertNil(transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106)))
-                            XCTAssertNil(transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 107)))
+                            XCTAssertNil(try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106)))
+                            XCTAssertNil(try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 107)))
                        }
                        transaction.unsafeContext().reset()
                        self.checkExpectationsImmediately()
@@ -910,7 +906,7 @@ class ImportTests: BaseTestDataTestCase {
                            
                            errorExpectation.fulfill()
                            
-                            let object = transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
+                            let object = try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 106))
                            XCTAssertNotNil(object)
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 106))
                            XCTAssertNil(object?.testBoolean)
@@ -951,9 +947,9 @@ class ImportTests: BaseTestDataTestCase {
                        catch _ as TestUpdateError {
                            
                            errorExpectation.fulfill()
-                            XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 5)
+                            XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 5)
                            
-                            let object = transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            let object = try transaction.fetchOne(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
                            XCTAssertNotNil(object)
                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 105))
                            XCTAssertEqual(object?.testBoolean, NSNumber(value: true))
@@ -963,11 +959,10 @@ class ImportTests: BaseTestDataTestCase {
                            XCTAssertEqual(object?.testData, ("nil:TestEntity1:5" as NSString).data(using: String.Encoding.utf8.rawValue)!)
                            XCTAssertEqual(object?.testDate, self.dateFormatter.date(from: "2000-01-05T00:00:00Z")!)
                            
-                            let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                            XCTAssertNotNil(existingObjects)
-                            XCTAssertEqual(existingObjects?.count, 1)
+                            let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                            XCTAssertEqual(existingObjects.count, 1)
                            
-                            let existingObject = existingObjects?[0]
+                            let existingObject = existingObjects[0]
                            XCTAssertEqual(existingObject, object)
                        }
                        transaction.context.reset()
@@ -1018,7 +1013,7 @@ class ImportTests: BaseTestDataTestCase {
                            sourceArray: sourceArray
                        )
                        XCTAssertEqual(objects.count, sourceArray.count)
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 6)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 6)
                        for i in 0 ..< sourceArray.count {
                            
                            let object = objects[i]
@@ -1032,11 +1027,10 @@ class ImportTests: BaseTestDataTestCase {
                            XCTAssertEqual(object.testData, dictionary[(#keyPath(TestEntity1.testData))] as? Data)
                            XCTAssertEqual(object.testDate, dictionary[(#keyPath(TestEntity1.testDate))] as? Date)
                        }
-                        let existingObjects = transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
-                        XCTAssertNotNil(existingObjects)
-                        XCTAssertEqual(existingObjects?.count, 1)
+                        let existingObjects = try transaction.fetchAll(From<TestEntity1>(), Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 105))
+                        XCTAssertEqual(existingObjects.count, 1)
                        
-                        let existingObject = existingObjects?[0]
+                        let existingObject = existingObjects[0]
                        XCTAssertEqual(existingObject, objects[0])
                    }
                )
--- a/CoreStoreTests/Info.plist
+++ b/CoreStoreTests/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>BNDL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>5.3.1</string>
+	<string>6.2.1</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
--- a/CoreStoreTests/ListObserverTests.swift
+++ b/CoreStoreTests/ListObserverTests.swift
@@ -76,7 +76,7 @@ class ListObserverTests: BaseTestDataTestCase {
                    XCTAssertEqual(
                        ((note.userInfo as NSDictionary?) ?? [:]),
                        [
-                            "sectionInfo": monitor.sectionInfoAtIndex(0),
+                            "sectionInfo": monitor.sectionInfo(at: 0),
                            "sectionIndex": 0
                        ] as NSDictionary
                    )
@@ -178,9 +178,9 @@ class ListObserverTests: BaseTestDataTestCase {
            XCTAssertTrue(monitor.hasSections())
            XCTAssertEqual(monitor.numberOfSections(), 2)
            XCTAssertTrue(monitor.hasObjects())
-            XCTAssertTrue(monitor.hasObjectsInSection(0))
-            XCTAssertEqual(monitor.numberOfObjectsInSection(0), 2)
-            XCTAssertEqual(monitor.numberOfObjectsInSection(1), 3)
+            XCTAssertTrue(monitor.hasObjects(in: 0))
+            XCTAssertEqual(monitor.numberOfObjects(in: 0), 2)
+            XCTAssertEqual(monitor.numberOfObjects(in: 1), 3)
            
            var events = 0
            
@@ -268,7 +268,7 @@ class ListObserverTests: BaseTestDataTestCase {
            stack.perform(
                asynchronous: { (transaction) -> Bool in
                    
-                    if let object = transaction.fetchOne(
+                    if let object = try transaction.fetchOne(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 101)) {
                        
@@ -282,7 +282,7 @@ class ListObserverTests: BaseTestDataTestCase {
                        
                        XCTFail()
                    }
-                    if let object = transaction.fetchOne(
+                    if let object = try transaction.fetchOne(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 102)) {
                        
@@ -394,7 +394,7 @@ class ListObserverTests: BaseTestDataTestCase {
            stack.perform(
                asynchronous: { (transaction) -> Bool in
                    
-                    if let object = transaction.fetchOne(
+                    if let object = try transaction.fetchOne(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 102)) {
                        
@@ -526,7 +526,7 @@ class ListObserverTests: BaseTestDataTestCase {
            stack.perform(
                asynchronous: { (transaction) -> Bool in
                    
-                    let count = transaction.deleteAll(
+                    let count = try transaction.deleteAll(
                        From<TestEntity1>(),
                        Where<TestEntity1>(#keyPath(TestEntity1.testBoolean), isEqualTo: false)
                    )
--- a/CoreStoreTests/Model.xcdatamodeld/Model.xcdatamodel/contents
+++ b/CoreStoreTests/Model.xcdatamodeld/Model.xcdatamodel/contents
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="11759" systemVersion="16C67" minimumToolsVersion="Xcode 4.3" sourceLanguage="Objective-C" userDefinedModelVersionIdentifier="">
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="14460.32" systemVersion="17G2307" minimumToolsVersion="Xcode 4.3" sourceLanguage="Objective-C" userDefinedModelVersionIdentifier="">
    <entity name="TestEntity1AAA" representedClassName="CoreStoreTests.TestEntity1" syncable="YES">
        <attribute name="testBoolean" optional="YES" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
        <attribute name="testData" optional="YES" attributeType="Binary" syncable="YES"/>
@@ -9,6 +9,8 @@
        <attribute name="testNil" optional="YES" attributeType="String" syncable="YES"/>
        <attribute name="testNumber" optional="YES" attributeType="Integer 32" usesScalarValueType="NO" syncable="YES"/>
        <attribute name="testString" optional="YES" attributeType="String" syncable="YES"/>
+        <relationship name="testToManyUnordered" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="TestEntity1AAA" inverseName="testToOne" inverseEntity="TestEntity1AAA" syncable="YES"/>
+        <relationship name="testToOne" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="TestEntity1AAA" inverseName="testToManyUnordered" inverseEntity="TestEntity1AAA" syncable="YES"/>
    </entity>
    <entity name="TestEntity2" representedClassName="CoreStoreTests.TestEntity2" syncable="YES">
        <attribute name="testBoolean" optional="YES" attributeType="Boolean" usesScalarValueType="NO" syncable="YES"/>
@@ -19,6 +21,8 @@
        <attribute name="testNil" optional="YES" attributeType="String" syncable="YES"/>
        <attribute name="testNumber" optional="YES" attributeType="Integer 32" usesScalarValueType="NO" syncable="YES"/>
        <attribute name="testString" optional="YES" attributeType="String" syncable="YES"/>
+        <relationship name="testToManyOrdered" optional="YES" toMany="YES" deletionRule="Nullify" ordered="YES" destinationEntity="TestEntity2" inverseName="testToOne" inverseEntity="TestEntity2" syncable="YES"/>
+        <relationship name="testToOne" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="TestEntity2" inverseName="testToManyOrdered" inverseEntity="TestEntity2" syncable="YES"/>
    </entity>
    <configuration name="Config1">
        <memberEntity name="TestEntity1AAA"/>
@@ -27,7 +31,7 @@
        <memberEntity name="TestEntity2"/>
    </configuration>
    <elements>
-        <element name="TestEntity1AAA" positionX="-63" positionY="-18" width="128" height="165"/>
-        <element name="TestEntity2" positionX="-63" positionY="9" width="128" height="165"/>
+        <element name="TestEntity1AAA" positionX="-63" positionY="-18" width="128" height="195"/>
+        <element name="TestEntity2" positionX="-63" positionY="9" width="128" height="195"/>
    </elements>
 </model>
--- a/CoreStoreTests/ObjectObserverTests.swift
+++ b/CoreStoreTests/ObjectObserverTests.swift
@@ -41,7 +41,7 @@ class ObjectObserverTests: BaseTestDataTestCase {
            
            self.prepareTestDataForStack(stack)
            
-            guard let object = stack.fetchOne(
+            guard let object = try stack.fetchOne(
                From<TestEntity1>(),
                Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 101)) else {
                    
@@ -138,7 +138,7 @@ class ObjectObserverTests: BaseTestDataTestCase {
            
            self.prepareTestDataForStack(stack)
            
-            guard let object = stack.fetchOne(
+            guard let object = try stack.fetchOne(
                From<TestEntity1>(),
                Where<TestEntity1>(#keyPath(TestEntity1.testEntityID), isEqualTo: 101)) else {
                    
--- a/CoreStoreTests/OrderByTests.swift
+++ b/CoreStoreTests/OrderByTests.swift
@@ -179,7 +179,7 @@ final class OrderByTests: XCTestCase {
    dynamic func test_ThatOrderByClauses_ApplyToFetchRequestsCorrectly() {
        
        let orderBy = OrderBy<NSManagedObject>(.ascending("key"))
-        let request = CoreStoreFetchRequest()
+        let request = CoreStoreFetchRequest<NSFetchRequestResult>()
        orderBy.applyToFetchRequest(request)
        XCTAssertNotNil(request.sortDescriptors)
        XCTAssertEqual(request.sortDescriptors ?? [], orderBy.sortDescriptors)
--- a/CoreStoreTests/QueryTests.swift
+++ b/CoreStoreTests/QueryTests.swift
@@ -47,7 +47,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(#keyPath(TestEntity1.testBoolean)),
                    queryClauses
@@ -57,7 +57,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -67,7 +67,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -77,7 +77,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -87,7 +87,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -97,7 +97,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -107,7 +107,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -117,7 +117,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -127,7 +127,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(#keyPath(TestEntity1.testNumber)),
                    queryClauses
@@ -137,7 +137,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(#keyPath(TestEntity1.testDecimal)),
                    queryClauses
@@ -147,7 +147,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(#keyPath(TestEntity1.testString)),
                    queryClauses
@@ -157,7 +157,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(#keyPath(TestEntity1.testString)),
                    queryClauses
@@ -167,7 +167,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(#keyPath(TestEntity1.testData)),
                    queryClauses
@@ -177,7 +177,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(#keyPath(TestEntity1.testData)),
                    queryClauses
@@ -187,7 +187,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(#keyPath(TestEntity1.testDate)),
                    queryClauses
@@ -197,7 +197,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(#keyPath(TestEntity1.testDate)),
                    queryClauses
@@ -207,7 +207,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(#keyPath(TestEntity1.testDate)),
                    queryClauses
@@ -232,7 +232,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.average(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -242,7 +242,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -252,7 +252,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -262,7 +262,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -272,7 +272,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -282,7 +282,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -292,7 +292,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -302,7 +302,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -312,7 +312,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.average(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -322,7 +322,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.average(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -332,7 +332,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.average(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -341,7 +341,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.average(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -350,7 +350,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.average(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -359,7 +359,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.average(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -368,7 +368,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.average(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -377,7 +377,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.average(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -386,7 +386,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(#keyPath(TestEntity1.testEntityID)),
                    queryClauses
@@ -410,7 +410,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.count(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -420,7 +420,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -430,7 +430,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -440,7 +440,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -450,7 +450,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -460,7 +460,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -470,7 +470,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -480,7 +480,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -490,7 +490,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.count(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -500,7 +500,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.count(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -509,7 +509,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.count(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -518,7 +518,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.count(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -527,7 +527,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.count(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -536,7 +536,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.count(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -545,7 +545,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.count(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -554,7 +554,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.count(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -563,7 +563,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.count(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -587,7 +587,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.maximum(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -597,7 +597,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -607,7 +607,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -617,7 +617,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -627,7 +627,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -637,7 +637,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -647,7 +647,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -657,7 +657,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -667,7 +667,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.maximum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -677,7 +677,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.maximum(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -687,7 +687,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.maximum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -697,7 +697,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.maximum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -707,7 +707,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.maximum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -717,7 +717,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.maximum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -727,7 +727,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.maximum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -737,7 +737,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.maximum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -747,7 +747,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.maximum(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -771,7 +771,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.minimum(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -781,7 +781,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -791,7 +791,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -801,7 +801,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -811,7 +811,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -821,7 +821,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -831,7 +831,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -841,7 +841,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -851,7 +851,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.minimum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -861,7 +861,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.minimum(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -871,7 +871,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.minimum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -881,7 +881,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.minimum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -891,7 +891,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.minimum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -901,7 +901,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.minimum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -911,7 +911,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.minimum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -921,7 +921,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.minimum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -931,7 +931,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.minimum(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -955,7 +955,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.sum(#keyPath(TestEntity1.testBoolean))),
                    queryClauses
@@ -965,7 +965,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -975,7 +975,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -985,7 +985,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -995,7 +995,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1005,7 +1005,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1015,7 +1015,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1025,7 +1025,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1035,7 +1035,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.sum(#keyPath(TestEntity1.testNumber))),
                    queryClauses
@@ -1045,7 +1045,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.sum(#keyPath(TestEntity1.testDecimal))),
                    queryClauses
@@ -1055,7 +1055,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.sum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -1064,7 +1064,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.sum(#keyPath(TestEntity1.testString))),
                    queryClauses
@@ -1073,7 +1073,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.sum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -1082,7 +1082,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.sum(#keyPath(TestEntity1.testData))),
                    queryClauses
@@ -1091,7 +1091,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.sum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -1100,7 +1100,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.sum(#keyPath(TestEntity1.testDate))),
                    queryClauses
@@ -1109,7 +1109,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.sum(#keyPath(TestEntity1.testEntityID))),
                    queryClauses
@@ -1133,7 +1133,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Bool>(.objectID()),
                    queryClauses
@@ -1142,7 +1142,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int8>(.objectID()),
                    queryClauses
@@ -1151,7 +1151,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int16>(.objectID()),
                    queryClauses
@@ -1160,7 +1160,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int32>(.objectID()),
                    queryClauses
@@ -1169,7 +1169,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int64>(.objectID()),
                    queryClauses
@@ -1178,7 +1178,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Int>(.objectID()),
                    queryClauses
@@ -1187,7 +1187,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Double>(.objectID()),
                    queryClauses
@@ -1196,7 +1196,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Float>(.objectID()),
                    queryClauses
@@ -1205,7 +1205,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSNumber>(.objectID()),
                    queryClauses
@@ -1214,7 +1214,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDecimalNumber>(.objectID()),
                    queryClauses
@@ -1223,7 +1223,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, String>(.objectID()),
                    queryClauses
@@ -1232,7 +1232,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSString>(.objectID()),
                    queryClauses
@@ -1241,7 +1241,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Data>(.objectID()),
                    queryClauses
@@ -1250,7 +1250,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSData>(.objectID()),
                    queryClauses
@@ -1259,7 +1259,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, Date>(.objectID()),
                    queryClauses
@@ -1268,7 +1268,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSDate>(.objectID()),
                    queryClauses
@@ -1277,7 +1277,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let value = stack.queryValue(
+                let value = try stack.queryValue(
                    from,
                    Select<TestEntity1, NSManagedObjectID>(.objectID()),
                    queryClauses
@@ -1302,7 +1302,7 @@ class QueryTests: BaseTestDataTestCase {
            ]
            do {
                
-                let values = stack.queryAttributes(
+                let values = try stack.queryAttributes(
                    from,
                    Select<TestEntity1, NSDictionary>(
                        #keyPath(TestEntity1.testBoolean),
@@ -1353,7 +1353,7 @@ class QueryTests: BaseTestDataTestCase {
            let queryClauses: [QueryClause] = []
            do {
                
-                let values = stack.queryAttributes(
+                let values = try stack.queryAttributes(
                    from,
                    Select<TestEntity1, NSDictionary>(
                        .sum(#keyPath(TestEntity1.testBoolean)),
@@ -1380,7 +1380,7 @@ class QueryTests: BaseTestDataTestCase {
            }
            do {
                
-                let values = stack.queryAttributes(
+                let values = try stack.queryAttributes(
                    from,
                    Select(
                        .sum(#keyPath(TestEntity1.testBoolean), as: "testSum"),
--- a/CoreStoreTests/SetupTests.swift
+++ b/CoreStoreTests/SetupTests.swift
@@ -330,7 +330,14 @@ class SetupTests: BaseTestDataTestCase {
                    xcodeModelName: "Model",
                    bundle: Bundle(for: type(of: self))
                )
-                try! stack.addStorageAndWait(sqliteStore)
+                try! stack.addStorageAndWait(
+                    SQLiteStore.legacy(
+                        fileName: sqliteStore.fileURL.lastPathComponent,
+                        configuration: sqliteStore.configuration,
+                        migrationMappingProviders: sqliteStore.migrationMappingProviders,
+                        localStorageOptions: .recreateStoreOnModelMismatch
+                    )
+                )
                self.prepareTestDataForStack(stack)
            }
            XCTAssertTrue(fileManager.fileExists(atPath: sqliteStore.fileURL.path))
--- a/CoreStoreTests/StorageInterfaceTests.swift
+++ b/CoreStoreTests/StorageInterfaceTests.swift
@@ -107,8 +107,8 @@ final class StorageInterfaceTests: XCTestCase {
    @objc
    dynamic func test_ThatFileURLSQLiteStores_ConfigureCorrectly() {
        
-        let fileURL = NSURL(fileURLWithPath: NSTemporaryDirectory())
-            .appendingPathComponent(NSUUID().uuidString, isDirectory: false)!
+        let fileURL = FileManager.default.temporaryDirectory
+            .appendingPathComponent(UUID().uuidString, isDirectory: false)
            .appendingPathExtension("db")
        let mappingProvider = XcodeSchemaMappingProvider(
            from: "V1", to: "V2",
--- a/CoreStoreTests/TestEntities/TestEntity1.swift
+++ b/CoreStoreTests/TestEntities/TestEntity1.swift
@@ -36,4 +36,6 @@ class TestEntity1: NSManagedObject {
    @NSManaged var testDecimal: NSDecimalNumber?
    @NSManaged var testData: Data?
    @NSManaged var testNil: String?
+    @NSManaged var testToOne: TestEntity1?
+    @NSManaged var testToManyUnordered: NSSet?
 }
--- a/CoreStoreTests/TestEntities/TestEntity2.swift
+++ b/CoreStoreTests/TestEntities/TestEntity2.swift
@@ -36,4 +36,6 @@ class TestEntity2: NSManagedObject {
    @NSManaged var testDecimal: NSDecimalNumber?
    @NSManaged var testData: Data?
    @NSManaged var testNil: String?
+    @NSManaged var testToOne: TestEntity2?
+    @NSManaged var testToManyOrdered: NSOrderedSet?
 }
--- a/CoreStoreTests/TransactionTests.swift
+++ b/CoreStoreTests/TransactionTests.swift
@@ -69,9 +69,9 @@ final class TransactionTests: BaseTestCase {
                self.checkExpectationsImmediately()
                XCTAssertTrue(hasChanges)
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
                XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
@@ -84,14 +84,14 @@ final class TransactionTests: BaseTestCase {
            do {
                
                let updateExpectation = self.expectation(description: "update")
-                let hasChanges: Bool = try! stack.perform(
+                let hasChanges: Bool = try stack.perform(
                    synchronous: { (transaction) in
                        
                        defer {
                            
                            updateExpectation.fulfill()
                        }
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            // TODO: convert fetch methods to throwing methods
                            XCTFail() 
                            try transaction.cancel()
@@ -107,9 +107,9 @@ final class TransactionTests: BaseTestCase {
                self.checkExpectationsImmediately()
                XCTAssertTrue(hasChanges)
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1_edit")
@@ -128,7 +128,7 @@ final class TransactionTests: BaseTestCase {
                                
                                deleteExpectation.fulfill()
                            }
-                            let object = transaction.fetchOne(From<TestEntity1>())
+                            let object = try transaction.fetchOne(From<TestEntity1>())
                            transaction.delete(object)
                            return transaction.hasChanges
                        }
@@ -141,9 +141,9 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNil(object)
            }
        }
@@ -184,10 +184,10 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1")
@@ -206,7 +206,7 @@ final class TransactionTests: BaseTestCase {
                                
                                updateExpectation.fulfill()
                            }
-                            guard let object = transaction.fetchOne(From<TestEntity1>("Config1")) else {
+                            guard let object = try transaction.fetchOne(From<TestEntity1>("Config1")) else {
                                
                                XCTFail()
                                try transaction.cancel()
@@ -226,10 +226,10 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1_edit")
@@ -248,7 +248,7 @@ final class TransactionTests: BaseTestCase {
                                
                                deleteExpectation.fulfill()
                            }
-                            let object = transaction.fetchOne(From<TestEntity1>("Config1"))
+                            let object = try transaction.fetchOne(From<TestEntity1>("Config1"))
                            transaction.delete(object)
                            
                            return transaction.hasChanges
@@ -262,8 +262,8 @@ final class TransactionTests: BaseTestCase {
                }
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 0)
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
            }
        }
    }
@@ -294,17 +294,17 @@ final class TransactionTests: BaseTestCase {
                )
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNil(object)
            }
            let testDate = Date()
            do {
                
                let createExpectation = self.expectation(description: "create")
-                let dataPrepared: Void? = try? stack.perform(
-                    synchronous: { (transaction) in
+                try stack.perform(
+                    synchronous: { (transaction) -> Void in
                        
                        let object = transaction.create(Into<TestEntity1>())
                        object.testEntityID = NSNumber(value: 1)
@@ -313,10 +313,7 @@ final class TransactionTests: BaseTestCase {
                        object.testDate = testDate
                    }
                )
-                if dataPrepared != nil {
-                    
-                    createExpectation.fulfill()
-                }
+                createExpectation.fulfill()
                self.checkExpectationsImmediately()
            }
            do {
@@ -329,7 +326,7 @@ final class TransactionTests: BaseTestCase {
                            
                            updateDiscardExpectation.fulfill()
                        }
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -343,9 +340,9 @@ final class TransactionTests: BaseTestCase {
                )
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1")
@@ -362,7 +359,7 @@ final class TransactionTests: BaseTestCase {
                            
                            deleteDiscardExpectation.fulfill()
                        }
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -374,9 +371,9 @@ final class TransactionTests: BaseTestCase {
                )
                self.checkExpectationsImmediately()
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                
-                let object = stack.fetchOne(From<TestEntity1>())
+                let object = try stack.fetchOne(From<TestEntity1>())
                XCTAssertNotNil(object)
                XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                XCTAssertEqual(object?.testString, "string1")
@@ -520,19 +517,26 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
-                        XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
-                        
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1")
-                        XCTAssertEqual(object?.testNumber, 100)
-                        XCTAssertEqual(object?.testDate, testDate)
-                        createExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
+                            XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
+
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1")
+                            XCTAssertEqual(object?.testNumber, 100)
+                            XCTAssertEqual(object?.testDate, testDate)
+                            createExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -546,7 +550,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -560,16 +564,23 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1_edit")
-                        XCTAssertEqual(object?.testNumber, 200)
-                        XCTAssertEqual(object?.testDate, Date.distantFuture)
-                        updateExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1_edit")
+                            XCTAssertEqual(object?.testNumber, 200)
+                            XCTAssertEqual(object?.testDate, Date.distantFuture)
+                            updateExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -583,7 +594,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        let object = transaction.fetchOne(From<TestEntity1>())
+                        let object = try transaction.fetchOne(From<TestEntity1>())
                        transaction.delete(object)
                        
                        return transaction.hasChanges
@@ -591,12 +602,19 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNil(object)
-                        deleteExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNil(object)
+                            deleteExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -631,17 +649,24 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>("Config1"))
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1")
-                        XCTAssertEqual(object?.testNumber, 100)
-                        XCTAssertEqual(object?.testDate, testDate)
-                        createExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
+
+                            let object = try stack.fetchOne(From<TestEntity1>("Config1"))
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1")
+                            XCTAssertEqual(object?.testNumber, 100)
+                            XCTAssertEqual(object?.testDate, testDate)
+                            createExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -655,7 +680,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>("Config1")) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>("Config1")) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -669,17 +694,24 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>("Config1"))
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1_edit")
-                        XCTAssertEqual(object?.testNumber, 200)
-                        XCTAssertEqual(object?.testDate, Date.distantFuture)
-                        updateExpectation.fulfill()
+
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
+
+                            let object = try stack.fetchOne(From<TestEntity1>("Config1"))
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1_edit")
+                            XCTAssertEqual(object?.testNumber, 200)
+                            XCTAssertEqual(object?.testDate, Date.distantFuture)
+                            updateExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -693,7 +725,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        let object = transaction.fetchOne(From<TestEntity1>("Config1"))
+                        let object = try transaction.fetchOne(From<TestEntity1>("Config1"))
                        transaction.delete(object)
                        
                        return transaction.hasChanges
@@ -701,11 +733,21 @@ final class TransactionTests: BaseTestCase {
                    success: { (hasChanges) in
                        
                        XCTAssertTrue(hasChanges)
-                        
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 0)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
-                        
-                        deleteExpectation.fulfill()
+
+                        do {
+
+                            let configCount = try stack.fetchCount(From<TestEntity1>("Config1"))
+                            XCTAssertEqual(configCount, 0)
+
+                            let defaultCount = try stack.fetchCount(From<TestEntity1>(nil))
+                            XCTAssertEqual(defaultCount, 0)
+
+                            deleteExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    },
                    failure: { _ in
                        
@@ -754,8 +796,8 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Bool in
                        
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 0)
-                        XCTAssertNil(transaction.fetchOne(From<TestEntity1>()))
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 0)
+                        XCTAssertNil(try transaction.fetchOne(From<TestEntity1>()))
                        
                        let object = transaction.create(Into<TestEntity1>())
                        object.testEntityID = NSNumber(value: 1)
@@ -782,7 +824,7 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Void in
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            return
@@ -811,9 +853,9 @@ final class TransactionTests: BaseTestCase {
                stack.perform(
                    asynchronous: { (transaction) -> Void in
                        
-                        XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
+                        XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
                        
-                        guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                        guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                            
                            XCTFail()
                            try transaction.cancel()
@@ -835,15 +877,22 @@ final class TransactionTests: BaseTestCase {
                    failure: { (error) in
                        
                        XCTAssertEqual(error, CoreStoreError.userCancelled)
-                        XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                        
-                        let object = stack.fetchOne(From<TestEntity1>())
-                        XCTAssertNotNil(object)
-                        XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
-                        XCTAssertEqual(object?.testString, "string1")
-                        XCTAssertEqual(object?.testNumber, 100)
-                        XCTAssertEqual(object?.testDate, testDate)
-                        deleteDiscardExpectation.fulfill()
+                        do {
+
+                            XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+
+                            let object = try stack.fetchOne(From<TestEntity1>())
+                            XCTAssertNotNil(object)
+                            XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
+                            XCTAssertEqual(object?.testString, "string1")
+                            XCTAssertEqual(object?.testNumber, 100)
+                            XCTAssertEqual(object?.testDate, testDate)
+                            deleteDiscardExpectation.fulfill()
+                        }
+                        catch {
+
+                            XCTFail()
+                        }
                    }
                )
            }
@@ -878,9 +927,9 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                    
-                    let object = stack.fetchOne(From<TestEntity1>())
+                    let object = try stack.fetchOne(From<TestEntity1>())
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.fetchSource()?.unsafeContext(), stack.mainContext)
                    XCTAssertEqual(object?.querySource()?.unsafeContext(), stack.mainContext)
@@ -897,7 +946,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                    
                    XCTFail()
                    return
@@ -911,9 +960,9 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
                    
-                    let object = stack.fetchOne(From<TestEntity1>())
+                    let object = try stack.fetchOne(From<TestEntity1>())
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object?.testString, "string1_edit")
@@ -927,7 +976,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                let object = transaction.fetchOne(From<TestEntity1>())
+                let object = try transaction.fetchOne(From<TestEntity1>())
                transaction.delete(object)
                
                do {
@@ -935,8 +984,8 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
-                    XCTAssertNil(stack.fetchOne(From<TestEntity1>()))
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
+                    XCTAssertNil(try stack.fetchOne(From<TestEntity1>()))
                }
                catch {
                    
@@ -967,10 +1016,10 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                    
-                    let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                    let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object?.testString, "string1")
@@ -984,7 +1033,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>("Config1")) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>("Config1")) else {
                    
                    XCTFail()
                    return
@@ -998,10 +1047,10 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 1)
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 1)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                    
-                    let object = stack.fetchOne(From<TestEntity1>("Config1"))
+                    let object = try stack.fetchOne(From<TestEntity1>("Config1"))
                    XCTAssertNotNil(object)
                    XCTAssertEqual(object?.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object?.testString, "string1_edit")
@@ -1015,7 +1064,7 @@ final class TransactionTests: BaseTestCase {
            }
            do {
                
-                let object = transaction.fetchOne(From<TestEntity1>("Config1"))
+                let object = try transaction.fetchOne(From<TestEntity1>("Config1"))
                transaction.delete(object)
                
                do {
@@ -1023,8 +1072,8 @@ final class TransactionTests: BaseTestCase {
                    XCTAssertTrue(transaction.hasChanges)
                    try transaction.commitAndWait()
                    
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>("Config1")), 0)
-                    XCTAssertEqual(stack.fetchCount(From<TestEntity1>(nil)), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>("Config1")), 0)
+                    XCTAssertEqual(try stack.fetchCount(From<TestEntity1>(nil)), 0)
                }
                catch {
                    
@@ -1050,11 +1099,11 @@ final class TransactionTests: BaseTestCase {
                
                transaction.rollback()
                
-                XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 0)
-                XCTAssertNil(transaction.fetchOne(From<TestEntity1>()))
+                XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertNil(try transaction.fetchOne(From<TestEntity1>()))
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 0)
-                XCTAssertNil(stack.fetchOne(From<TestEntity1>()))
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 0)
+                XCTAssertNil(try stack.fetchOne(From<TestEntity1>()))
            }
            
            let testDate = Date()
@@ -1079,7 +1128,7 @@ final class TransactionTests: BaseTestCase {
            
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                    
                    XCTFail()
                    return
@@ -1090,8 +1139,8 @@ final class TransactionTests: BaseTestCase {
                
                transaction.rollback()
                
-                XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
-                if let object = transaction.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
+                if let object = try transaction.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
@@ -1103,8 +1152,8 @@ final class TransactionTests: BaseTestCase {
                    XCTFail()
                }
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                if let object = stack.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+                if let object = try stack.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
@@ -1119,7 +1168,7 @@ final class TransactionTests: BaseTestCase {
            
            do {
                
-                guard let object = transaction.fetchOne(From<TestEntity1>()) else {
+                guard let object = try transaction.fetchOne(From<TestEntity1>()) else {
                    
                    XCTFail()
                    return
@@ -1128,8 +1177,8 @@ final class TransactionTests: BaseTestCase {
                
                transaction.rollback()
                
-                XCTAssertEqual(transaction.fetchCount(From<TestEntity1>()), 1)
-                if let object = transaction.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try transaction.fetchCount(From<TestEntity1>()), 1)
+                if let object = try transaction.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
@@ -1141,8 +1190,8 @@ final class TransactionTests: BaseTestCase {
                    XCTFail()
                }
                
-                XCTAssertEqual(stack.fetchCount(From<TestEntity1>()), 1)
-                if let object = stack.fetchOne(From<TestEntity1>()) {
+                XCTAssertEqual(try stack.fetchCount(From<TestEntity1>()), 1)
+                if let object = try stack.fetchOne(From<TestEntity1>()) {
                    
                    XCTAssertEqual(object.testEntityID, NSNumber(value: 1))
                    XCTAssertEqual(object.testString, "string1")
--- a/CoreStoreTests/TweakTests.swift
+++ b/CoreStoreTests/TweakTests.swift
@@ -43,7 +43,7 @@ final class TweakTests: XCTestCase {
            $0.fetchLimit = 200
            $0.predicate = predicate
        }
-        let request = CoreStoreFetchRequest()
+        let request = CoreStoreFetchRequest<NSFetchRequestResult>()
        tweak.applyToFetchRequest(request)
        XCTAssertEqual(request.fetchOffset, 100)
        XCTAssertEqual(request.fetchLimit, 200)
--- a/CoreStoreTests/WhereTests.swift
+++ b/CoreStoreTests/WhereTests.swift
@@ -56,6 +56,275 @@ final class WhereTests: XCTestCase {
    dynamic func test_ThatDynamicModelKeyPaths_CanBeCreated() {
        
        XCTAssertEqual(String(keyPath: \TestEntity1.testEntityID), "testEntityID")
+        XCTAssertEqual(String(keyPath: \Animal.color), "color")
+    }
+
+    @objc
+    dynamic func test_ThatExpressions_HaveCorrectKeyPaths() {
+
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    #keyPath(TestEntity1.testToOne.testEntityID),
+                    (\TestEntity1.testToOne ~ \.testEntityID).description,
+                    String(keyPath: \TestEntity1.testToOne ~ \.testEntityID)
+                )
+                XCTAssertEqual(
+                    #keyPath(TestEntity1.testToOne.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToOne ~ \.testToManyUnordered).description,
+                    String(keyPath: \TestEntity1.testToOne ~ \.testToOne ~ \.testToManyUnordered)
+                )
+                XCTAssertEqual(
+                    #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).description,
+                    String(keyPath: \TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered)
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "master.pets",
+                    (\Animal.master ~ \.pets).description,
+                    String(keyPath: \Animal.master ~ \.pets)
+                )
+                XCTAssertEqual(
+                    "master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).description,
+                    String(keyPath: \Animal.master ~ \.pets ~ \.species)
+                )
+                XCTAssertEqual(
+                    "master.pets.master",
+                    (\Animal.master ~ \.pets ~ \.master).description,
+                    String(keyPath: \Animal.master ~ \.pets ~ \.master)
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    #keyPath(TestEntity1.testToOne.testToManyUnordered) + ".@count",
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).count().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).count())
+                )
+                XCTAssertEqual(
+                    #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered) + ".@count",
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).count().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).count())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "master.pets.@count",
+                    (\Animal.master ~ \.pets).count().description,
+                    String(keyPath: (\Animal.master ~ \.pets).count())
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    "ANY " + #keyPath(TestEntity1.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).any().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).any())
+                )
+                XCTAssertEqual(
+                    "ANY " + #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).any().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).any())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "ANY master.pets",
+                    (\Animal.master ~ \.pets).any().description,
+                    String(keyPath: (\Animal.master ~ \.pets).any())
+                )
+                XCTAssertEqual(
+                    "ANY master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).any().description,
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).any())
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    "ALL " + #keyPath(TestEntity1.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).all().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).all())
+                )
+                XCTAssertEqual(
+                    "ALL " + #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).all().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).all())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "ALL master.pets",
+                    (\Animal.master ~ \.pets).all().description,
+                    String(keyPath: (\Animal.master ~ \.pets).all())
+                )
+                XCTAssertEqual(
+                    "ALL master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).all().description,
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).all())
+                )
+            }
+        }
+        do {
+
+            do {
+
+                XCTAssertEqual(
+                    "NONE " + #keyPath(TestEntity1.testToOne.testToManyUnordered),
+                    (\TestEntity1.testToOne ~ \.testToManyUnordered).none().description,
+                    String(keyPath: (\TestEntity1.testToOne ~ \.testToManyUnordered).none())
+                )
+                XCTAssertEqual(
+                    "NONE " + #keyPath(TestEntity2.testToOne.testToOne.testToManyOrdered),
+                    (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).none().description,
+                    String(keyPath: (\TestEntity2.testToOne ~ \.testToOne ~ \.testToManyOrdered).none())
+                )
+            }
+            do {
+
+                XCTAssertEqual(
+                    "NONE master.pets",
+                    (\Animal.master ~ \.pets).none().description,
+                    String(keyPath: (\Animal.master ~ \.pets).none())
+                )
+                XCTAssertEqual(
+                    "NONE master.pets.species",
+                    (\Animal.master ~ \.pets ~ \.species).none().description,
+                    String(keyPath: (\Animal.master ~ \.pets ~ \.species).none())
+                )
+            }
+        }
+    }
+
+    @objc
+    dynamic func test_ThatWhereClauses_CanBeCreatedFromExpressionsCorrectly() {
+
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testString) == dummy
+                let predicate = NSPredicate(format: "\(#keyPath(TestEntity1.testToOne.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.name) == dummy
+                let predicate = NSPredicate(format: "master.name == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToOne ~ \.testString) == dummy
+                let predicate = NSPredicate(format: "\(#keyPath(TestEntity1.testToOne.testToOne.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.spouse ~ \.name) == dummy
+                let predicate = NSPredicate(format: "master.spouse.name == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let count = 3
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered).count() == count
+                let predicate = NSPredicate(format: "\(#keyPath(TestEntity1.testToOne.testToManyUnordered)).@count == %d", count)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets).count() == count
+                let predicate = NSPredicate(format: "master.pets.@count == %d", count)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered ~ \TestEntity1.testString).any() == dummy
+                let predicate = NSPredicate(format: "ANY \(#keyPath(TestEntity1.testToOne.testToManyUnordered)).\(#keyPath(TestEntity1.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).any() == dummy
+                let predicate = NSPredicate(format: "ANY master.pets.species == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered ~ \TestEntity1.testString).all() == dummy
+                let predicate = NSPredicate(format: "ALL \(#keyPath(TestEntity1.testToOne.testToManyUnordered)).\(#keyPath(TestEntity1.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).all() == dummy
+                let predicate = NSPredicate(format: "ALL master.pets.species == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
+        do {
+
+            let dummy = "dummy"
+            do {
+
+                let whereClause: Where<TestEntity1> = (\.testToOne ~ \.testToManyUnordered ~ \TestEntity1.testString).none() == dummy
+                let predicate = NSPredicate(format: "NONE \(#keyPath(TestEntity1.testToOne.testToManyUnordered)).\(#keyPath(TestEntity1.testString)) == %@", dummy)
+                XCTAssertEqual(whereClause, Where<TestEntity1>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+            do {
+
+                let whereClause: Where<Animal> = (\.master ~ \.pets ~ \.species).none() == dummy
+                let predicate = NSPredicate(format: "NONE master.pets.species == %@", dummy)
+                XCTAssertEqual(whereClause, Where<Animal>(predicate))
+                XCTAssertEqual(whereClause.predicate, predicate)
+            }
+        }
    }
    
    @objc
@@ -314,7 +583,7 @@ final class WhereTests: XCTestCase {
    dynamic func test_ThatWhereClauses_ApplyToFetchRequestsCorrectly() {
        
        let whereClause = Where<NSManagedObject>("key", isEqualTo: "value")
-        let request = CoreStoreFetchRequest()
+        let request = CoreStoreFetchRequest<NSFetchRequestResult>()
        whereClause.applyToFetchRequest(request)
        XCTAssertNotNil(request.predicate)
        XCTAssertEqual(request.predicate, whereClause.predicate)
--- a/Package.swift
+++ b/Package.swift
@@ -1,3 +1,4 @@
+// swift-tools-version:4.2
 //
 //  Package.swift
 //  CoreStore
@@ -25,21 +26,18 @@

 import PackageDescription

-let targets: [Target]
-#if os(iOS)
-targets = [Target(name: "CoreStore iOS")]
-#elseif os(macOS)
-targets = [Target(name: "CoreStore OSX")]
-#elseif os(watchOS)
-targets = [Target(name: "CoreStore watchOS")]
-#elseif os(tvOS)
-targets = [Target(name: "CoreStore tvOS")]
-#else
-targets = []
-#endif
-
 let package = Package(
    name: "CoreStore",
-    targets: targets,
-    exclude: ["Carthage", "CoreStoreDemo", "Sources/libA/images"]
+    products: [
+        .library(name: "CoreStore", type: .static, targets: ["CoreStore"])
+    ],
+    dependencies: [],
+    targets: [
+        .target(
+            name: "CoreStore",
+            dependencies: [],
+            path: "Sources",
+            exclude: ["CoreStoreBridge.h", "CoreStoreBridge.m"]
+        )
+    ]
 )
--- a/Playground_iOS.playground/Contents.swift
+++ b/Playground_iOS.playground/Contents.swift
@@ -0,0 +1,79 @@
+import UIKit
+import CoreStore
+import PlaygroundSupport
+
+PlaygroundPage.current.needsIndefiniteExecution = true
+
+/// Model Declaration =====
+class Animal: CoreStoreObject {
+    let species = Value.Required<String>("species", initial: "Swift")
+    let master = Relationship.ToOne<Person>("master")
+    let color = Transformable.Optional<UIColor>("color", initial: .orange)
+}
+
+class Person: CoreStoreObject {
+    let name = Value.Optional<String>("name")
+    let pets = Relationship.ToManyUnordered<Animal>("pets", inverse: { $0.master })
+}
+/// =======================
+
+/// Stack setup ===========
+let dataStack = DataStack(
+    CoreStoreSchema(
+        modelVersion: "V1",
+        entities: [
+            Entity<Animal>("Animal"),
+            Entity<Person>("Person")
+        ]
+    )
+)
+dataStack.addStorage(
+    SQLiteStore(fileName: "data.sqlite"),
+    completion: { result in
+
+        switch result {
+
+        case .failure(let error):
+            print(error)
+
+        case .success:
+            /// Transactions ==========
+            dataStack.perform(
+                asynchronous: { transaction in
+
+                    let animal = transaction.create(Into<Animal>())
+                    animal.species .= "Sparrow"
+                    animal.color .= .yellow
+
+                    let person = transaction.create(Into<Person>())
+                    person.name .= "John"
+                    person.pets.value.insert(animal)
+                },
+                completion: { result in
+
+                    switch result {
+
+                    case .failure(let error):
+                        print(error)
+
+                    case .success:
+                        /// Accessing Objects =====
+                        let bird = try! dataStack.fetchOne(From<Animal>().where(\.species == "Sparrow"))!
+                        print(bird.species.value)
+                        print(bird.color.value as Any)
+                        print(bird)
+
+                        let owner = bird.master.value!
+                        print(owner.name.value as Any)
+                        print(owner.pets.count)
+                        print(owner)
+                        /// =======================
+                    }
+                }
+            )
+            /// =======================
+        }
+    }
+)
+
+
--- a/Playground_iOS.playground/contents.xcplayground
+++ b/Playground_iOS.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
--- a/Playground_iOS.playground/playground.xcworkspace/contents.xcworkspacedata
+++ b/Playground_iOS.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+</Workspace>
--- a/Playground_macOS.playground/Contents.swift
+++ b/Playground_macOS.playground/Contents.swift
@@ -0,0 +1,77 @@
+import AppKit
+import CoreStore
+import PlaygroundSupport
+
+PlaygroundPage.current.needsIndefiniteExecution = true
+
+/// Model Declaration =====
+class Animal: CoreStoreObject {
+    let species = Value.Required<String>("species", initial: "Swift")
+    let master = Relationship.ToOne<Person>("master")
+    let color = Transformable.Optional<NSColor>("color", initial: .orange)
+}
+
+class Person: CoreStoreObject {
+    let name = Value.Optional<String>("name")
+    let pets = Relationship.ToManyUnordered<Animal>("pets", inverse: { $0.master })
+}
+/// =======================
+
+/// Stack setup ===========
+let dataStack = DataStack(
+    CoreStoreSchema(
+        modelVersion: "V1",
+        entities: [
+            Entity<Animal>("Animal"),
+            Entity<Person>("Person")
+        ]
+    )
+)
+dataStack.addStorage(
+    SQLiteStore(fileName: "data.sqlite"),
+    completion: { result in
+
+        switch result {
+
+        case .failure(let error):
+            print(error)
+
+        case .success:
+            /// Transactions ==========
+            dataStack.perform(
+                asynchronous: { transaction in
+
+                    let animal = transaction.create(Into<Animal>())
+                    animal.species .= "Sparrow"
+                    animal.color .= .yellow
+
+                    let person = transaction.create(Into<Person>())
+                    person.name .= "John"
+                    person.pets.value.insert(animal)
+                },
+                completion: { result in
+
+                    switch result {
+
+                    case .failure(let error):
+                        print(error)
+
+                    case .success:
+                        /// Accessing Objects =====
+                        let bird = try! dataStack.fetchOne(From<Animal>().where(\.species == "Sparrow"))!
+                        print(bird.species.value)
+                        print(bird.color.value as Any)
+                        print(bird)
+
+                        let owner = bird.master.value!
+                        print(owner.name.value as Any)
+                        print(owner.pets.count)
+                        print(owner)
+                        /// =======================
+                    }
+                }
+            )
+            /// =======================
+        }
+    }
+)
--- a/Playground_macOS.playground/contents.xcplayground
+++ b/Playground_macOS.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='macos' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
--- a/Playground_macOS.playground/playground.xcworkspace/contents.xcworkspacedata
+++ b/Playground_macOS.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
--- a/Playground_macOS.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/Playground_macOS.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
--- a/README.md
+++ b/README.md
@@ -6,22 +6,23 @@ Unleashing the real power of Core Data with the elegance and safety of Swift
 <br />
 <br />
 <a href="https://travis-ci.org/JohnEstropia/CoreStore"><img alt="Build Status" src="https://img.shields.io/travis/JohnEstropia/CoreStore/master.svg?style=flat" /></a>
+<a href="https://github.com/JohnEstropia/CoreStore/commits"><img alt="Last Commit" src="https://img.shields.io/github/last-commit/johnestropia/corestore.svg?style=flat" /></a>
 <a href="http://cocoadocs.org/docsets/CoreStore"><img alt="Platform" src="https://img.shields.io/cocoapods/p/CoreStore.svg?style=flat" /></a>
 <a href="https://raw.githubusercontent.com/JohnEstropia/CoreStore/master/LICENSE"><img alt="License" src="https://img.shields.io/cocoapods/l/CoreStore.svg?style=flat" /></a>
 <br /><br />Dependency managers<br />
 <a href="https://cocoapods.org/pods/CoreStore"><img alt="Cocoapods compatible" src="https://img.shields.io/cocoapods/v/CoreStore.svg?style=flat&label=Cocoapods" /></a>
 <a href="https://github.com/Carthage/Carthage"><img alt="Carthage compatible" src="https://img.shields.io/badge/Carthage-compatible-16a085.svg?style=flat" /></a>
-<a href="https://swiftpkgs.ng.bluemix.net/package/JohnEstropia/CoreStore"><img alt="Swift Package Manager compatible" src="https://img.shields.io/badge/Swift_Package_Manager-compatible-orange.svg?style=flat" /></a>
+<a href="https://swift.org/source-compatibility/#current-list-of-projects"><img alt="Swift Package Manager compatible" src="https://img.shields.io/badge/Swift_Package_Manager-compatible-orange.svg?style=flat" /></a>
 <br /><br />Contact<br />
 <a href="http://swift-corestore-slack.herokuapp.com/"><img alt="Join us on Slack!" src="http://swift-corestore-slack.herokuapp.com/badge.svg" /></a>
 <a href="https://twitter.com/JohnEstropia"><img alt="Reach me on Twitter!" src="https://img.shields.io/badge/twitter-%40JohnEstropia-3498db.svg" /></a>
 <br />
 </p>

-* **Swift 4.2:** iOS 9+ / macOS 10.10+ / watchOS 2.0+ / tvOS 9.0+
-* Other Swift versions: [Swift 3.2(version 4.2.3)](https://github.com/JohnEstropia/CoreStore/tree/4.2.3)
+* **Swift 5.0:** iOS 10+ / macOS 10.12+ / watchOS 3.0+ / tvOS 10.0+
+* Previously supported Swift versions: [Swift 3.2](https://github.com/JohnEstropia/CoreStore/tree/4.2.3), [Swift 4.2](https://github.com/JohnEstropia/CoreStore/tree/6.2.1)

-Upgrading from CoreStore 4.2 (Swift 3.2) to 5.x (Swift 4.x)? Check out the [new features](#features) and make sure to read the [Change logs](https://github.com/JohnEstropia/CoreStore/releases).
+Upgrading from CoreStore 5.x (min iOS 9) to 6.x (min iOS 10)? Check out the [new features](#features) and make sure to read the [Change logs](https://github.com/JohnEstropia/CoreStore/releases).

 CoreStore is now part of the [Swift Source Compatibility projects](https://swift.org/source-compatibility/#current-list-of-projects).

@@ -58,13 +59,12 @@ CoreStore was (and is) heavily shaped by real-world needs of developing data-dep
    - [Setting up](#setting-up)
        - [In-memory store](#in-memory-store)
        - [Local store](#local-store)
-        - [iCloud store](#icloud-store)
    - [Migrations](#migrations)
        - [Declaring model versions](#declaring-model-versions)
        - [Starting migrations](#starting-migrations)
        - [Progressive migrations](#progressive-migrations)
        - [Forecasting migrations](#forecasting-migrations)
-        - [Custom migratoins](#custom-migrations)
+        - [Custom migrations](#custom-migrations)
    - [Saving and processing transactions](#saving-and-processing-transactions)
        - [Transaction types](#transaction-types)
            - [Asynchronous transactions](#asynchronous-transactions)
@@ -86,6 +86,7 @@ CoreStore was (and is) heavily shaped by real-world needs of developing data-dep
            - [`GroupBy` clause](#groupby-clause)
    - [Logging and error reporting](#logging-and-error-reporting)
    - [Observing changes and notifications](#observing-changes-and-notifications)
+        - [Observe a single property](#observe-a-single-property)
        - [Observe a single object](#observe-a-single-object)
        - [Observe a list of objects](#observe-a-list-of-objects)
    - [Objective-C support](#objective-c-support)
@@ -139,12 +140,12 @@ CoreStore.perform(

 Fetching objects (simple):
 ```swift
-let people = CoreStore.fetchAll(From<MyPersonEntity>())
+let people = try CoreStore.fetchAll(From<MyPersonEntity>())
 ```

 Fetching objects (complex):
 ```swift
-let people = CoreStore.fetchAll(
+let people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .where(\.age > 30),
        .orderBy(.ascending(\.name), .descending(.\age)),
@@ -154,7 +155,7 @@ let people = CoreStore.fetchAll(

 Querying values:
 ```swift
-let maxAge = CoreStore.queryValue(
+let maxAge = try CoreStore.queryValue(
    From<MyPersonEntity>()
        .select(Int.self, .maximum(\.age))
 )
@@ -311,66 +312,6 @@ public protocol LocalStorage: StorageInterface {
 ```
 If you have custom `NSIncrementalStore` or `NSAtomicStore` subclasses, you can implement this protocol and use it similarly to `SQLiteStore`.

-### iCloud Store
-> ⚠️**Important:** The iCloud Store is being deprecated. Please use with caution. If you have any concerns please do send me a message on [Twitter](https://twitter.com/JohnEstropia) or on the [CoreStore Slack Team](http://swift-corestore-slack.herokuapp.com/)
-
-As a counterpart to `LocalStorage`, the `CloudStorage` protocol abstracts stores managed in the cloud. CoreStore currently provides the concrete class `ICloudStore`. Unlike `InMemoryStore` and `SQLiteStore` though, the `ICloudStore`'s initializer may return `nil` if the iCloud container could not be located or if iCloud is not available on the device:
-```swift
-guard let storage = ICloudStore(
-    ubiquitousContentName: "MyAppCloudData", // the name of the store in iCloud
-    ubiquitousContentTransactionLogsSubdirectory: "logs/config1", // optional. Subdirectory path for the transaction logs
-    ubiquitousContainerID: "iCloud.com.mycompany.myapp.containername", // optional. The container if your app has multiple ubiquity container identifiers in its entitlements
-    ubiquitousPeerToken: "9614d658014f4151a95d8048fb717cf0", // optional. A per-application salt to allow multiple apps on the same device to share a Core Data store integrated with iCloud
-    configuration: "Config1", // optional. Use entities from the "Config1" configuration in the .xcdatamodeld file
-    cloudStorageOptions: .recreateLocalStoreOnModelMismatch // optional. Provides settings that tells the DataStack how to setup the persistent store
-) else {
-    // The iCloud container could not be located or if iCloud is not available on the device.
-    // Handle appropriately
-    return    
-}
-CoreStore.addStorage(,
-    storage,
-    completion: { result in
-        switch result {
-        case .success(let storage): // ...
-        case .failure(let error): // ...
-        }
-    }
-)
-```
-
-If your app is using iCloud stores, you may want to be notified of particular iCloud events. The `ICloudStoreObserver` functions are all optional, so you may implement only the ones your app is interested in:
-```swift
-public protocol ICloudStoreObserver: class {
-    func iCloudStoreWillFinishUbiquitousStoreInitialImport(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidFinishUbiquitousStoreInitialImport(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreWillAddAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidAddAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreWillRemoveAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidRemoveAccount(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreWillRemoveContent(storage storage: ICloudStore, dataStack: DataStack)
-    func iCloudStoreDidRemoveContent(storage storage: ICloudStore, dataStack: DataStack)
-}
-```
-To register your `ICloudStoreObserver`, call `addObserver(_:)` on the `ICloudStore` instance:
-
-```swift
-guard let storage = ICloudStore(/* ... */) else {
-    return    
-}
-storage.addObserver(self) // assuming self implements ICloudStoreObserver
-CoreStore.addStorage(,
-    storage,
-    completion: { result in
-        switch result {
-        case .success(let storage): // ... You may also call storage.addObserver(_:) here
-        case .failure(let error): // ...
-        }
-    }
-)
-```
-The `ICloudStore` only keeps weak references of the registered observers. You may call `removeObserver(_:)` for precise deregistration, but `ICloudStore` automatically removes deallocated observers.
-

 ## Migrations

@@ -851,7 +792,7 @@ To update an existing object, fetch the object's instance from the transaction:
 ```swift
 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        let person = transaction.fetchOne(
+        let person = try transaction.fetchOne(
            From<MyPersonEntity>()
                .where(\.name == "Jane Smith")
        )
@@ -913,8 +854,8 @@ let jane: MyPersonEntity = // ...

 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        transaction.delete(john, jane)
-        // transaction.delete([john, jane]) is also allowed
+        try transaction.delete(john, jane)
+        // try transaction.delete([john, jane]) is also allowed
    },
    completion: { _ in }
 )
@@ -923,7 +864,7 @@ If you do not have references yet to the objects to be deleted, transactions hav
 ```swift
 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        transaction.deleteAll(
+        try transaction.deleteAll(
            From<MyPersonEntity>()
                .where(\.age > 30)
        )
@@ -971,7 +912,7 @@ var peopleIDs: [NSManagedObjectID] = // ...

 CoreStore.perform(
    asynchronous: { (transaction) -> Void in
-        let jane = transaction.fetchOne(
+        let jane = try transaction.fetchOne(
            From<MyPersonEntity>()
                .where(\.name == "Jane Smith")
        )
@@ -1184,17 +1125,17 @@ Before we dive in, be aware that CoreStore distinguishes between *fetching* and
 #### `From` clause
 The search conditions for fetches and queries are specified using *clauses*. All fetches and queries require a `From` clause that indicates the target entity type:
 ```swift
-let people = CoreStore.fetchAll(From<MyPersonEntity>())
+let people = try CoreStore.fetchAll(From<MyPersonEntity>())
 ```
 `people` in the example above will be of type `[MyPersonEntity]`. The `From<MyPersonEntity>()` clause indicates a fetch to all persistent stores that `MyPersonEntity` belong to.

 If the entity exists in multiple configurations and you need to only search from a particular configuration, indicate in the `From` clause the configuration name for the destination persistent store:
 ```swift
-let people = CoreStore.fetchAll(From<MyPersonEntity>("Config1")) // ignore objects in persistent stores other than the "Config1" configuration
+let people = try CoreStore.fetchAll(From<MyPersonEntity>("Config1")) // ignore objects in persistent stores other than the "Config1" configuration
 ```
 or if the persistent store is the auto-generated "Default" configuration, specify `nil`:
 ```swift
-let person = CoreStore.fetchAll(From<MyPersonEntity>(nil))
+let person = try CoreStore.fetchAll(From<MyPersonEntity>(nil))
 ```
 Now we know how to use a `From` clause, let's move on to fetching and querying.

@@ -1214,11 +1155,11 @@ Each method's purpose is straightforward, but we need to understand how to set t

 The `Where` clause is CoreStore's `NSPredicate` wrapper. It specifies the search filter to use when fetching (or querying). It implements all initializers that `NSPredicate` does (except for `-predicateWithBlock:`, which Core Data does not support):
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    Where<MyPersonEntity>("%K > %d", "age", 30) // string format initializer
 )
-people = CoreStore.fetchAll(
+people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    Where<MyPersonEntity>(true) // boolean initializer
 )
@@ -1233,14 +1174,14 @@ var people = CoreStore.fetchAll(
 ```
 ⭐️Starting CoreStore 5.0, `Where` clauses became more type-safe and are now generic types. To avoid verbose repetition of the generic object type, fetch methods now support **Fetch Chain builders**. We can also use Swift's Smart KeyPaths as the `Where` clause expression:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .where(\.age > 30) // Type-safe!
 )
 ```
 `Where` clauses also implement the `&&`, `||`, and `!` logic operators, so you can provide logical conditions without writing too much `AND`, `OR`, and `NOT` strings:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .where(\.age > 30 && \.gender == "M")
 )
@@ -1251,7 +1192,7 @@ If you do not provide a `Where` clause, all objects that belong to the specified

 The `OrderBy` clause is CoreStore's `NSSortDescriptor` wrapper. Use it to specify attribute keys in which to sort the fetch (or query) results with.
 ```swift
-var mostValuablePeople = CoreStore.fetchAll(
+var mostValuablePeople = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    OrderBy<MyPersonEntity>(.descending("rating"), .ascending("surname"))
 )
@@ -1259,7 +1200,7 @@ var mostValuablePeople = CoreStore.fetchAll(
 As seen above, `OrderBy` accepts a list of `SortKey` enumeration values, which can be either `.ascending` or `.descending`.
 ⭐️As with `Where` clauses, CoreStore 5.0 turned `OrderBy` clauses into generic types. To avoid verbose repetition of the generic object type, fetch methods now support **Fetch Chain builders**. We can also use Swift's Smart KeyPaths as the `OrderBy` clause expression:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>()
        .orderBy(.descending(\.rating), .ascending(\.surname)) // Type-safe!
 )
@@ -1271,7 +1212,7 @@ var orderBy = OrderBy<MyPersonEntity>(.descending(\.rating))
 if sortFromYoungest {
    orderBy += OrderBy(.ascending(\.age))
 }
-var mostValuablePeople = CoreStore.fetchAll(
+var mostValuablePeople = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    orderBy
 )
@@ -1281,7 +1222,7 @@ var mostValuablePeople = CoreStore.fetchAll(

 The `Tweak` clause lets you, uh, *tweak* the fetch (or query). `Tweak` exposes the `NSFetchRequest` in a closure where you can make changes to its properties:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
    Where<MyPersonEntity>("age > %d", 30),
    OrderBy<MyPersonEntity>(.ascending("surname")),
@@ -1294,7 +1235,7 @@ var people = CoreStore.fetchAll(
 ```
 `Tweak` also supports **Fetch Chain builders**:
 ```swift
-var people = CoreStore.fetchAll(
+var people = try CoreStore.fetchAll(
    From<MyPersonEntity>(),
        .where(\.age > 30)
        .orderBy(.ascending(\.surname))
@@ -1325,7 +1266,7 @@ Setting up the `From`, `Where`, `OrderBy`, and `Tweak` clauses is similar to how

 The `Select<T>` clause specifies the target attribute/aggregate key, as well as the expected return type: 
 ```swift
-let johnsAge = CoreStore.queryValue(
+let johnsAge = try CoreStore.queryValue(
    From<MyPersonEntity>(),
    Select<Int>("age"),
    Where("name == %@", "John Smith")
@@ -1335,14 +1276,14 @@ The example above queries the "age" property for the first object that matches t

 For `queryAttributes(...)`, only `NSDictionary` is valid for `Select`, thus you are allowed to omit the generic type:
 ```swift
-let allAges = CoreStore.queryAttributes(
+let allAges = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("age")
 )
 ```
 ⭐️Starting CoreStore 5.0, query methods now support **Query Chain builders**. We can also use Swift's Smart KeyPaths to use in the expressions:
 ```swift
-let johnsAge = CoreStore.queryValue(
+let johnsAge = try CoreStore.queryValue(
    From<MyPersonEntity>()
        .select(\.age) // binds the result to Int
        .where(\.name == "John Smith")
@@ -1357,7 +1298,7 @@ If you only need a value for a particular attribute, you can just specify the ke
 - `.sum(...)`

 ```swift
-let oldestAge = CoreStore.queryValue(
+let oldestAge = try CoreStore.queryValue(
    From<MyPersonEntity>(),
    Select<Int>(.maximum("age"))
 )
@@ -1365,7 +1306,7 @@ let oldestAge = CoreStore.queryValue(

 For `queryAttributes(...)` which returns an array of dictionaries, you can specify multiple attributes/aggregates to `Select`:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("name", "age")
 )
@@ -1385,7 +1326,7 @@ let personJSON = CoreStore.queryAttributes(
 ```
 You can also include an aggregate as well:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("name", .count("friends"))
 )
@@ -1405,7 +1346,7 @@ which returns:
 ```
 The `"count(friends)"` key name was automatically used by CoreStore, but you can specify your own key alias if you need:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("name", .count("friends", as: "friendsCount"))
 )
@@ -1428,7 +1369,7 @@ which now returns:

 The `GroupBy` clause lets you group results by a specified attribute/aggregate. This is useful only for `queryAttributes(...)` since `queryValue(...)` just returns the first value.
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>(),
    Select("age", .count("age", as: "count")),
    GroupBy("age")
@@ -1436,7 +1377,7 @@ let personJSON = CoreStore.queryAttributes(
 ```
 ⭐️Starting CoreStore 5.0, `GroupBy` clauses are now also generic types and now support **Query Chain builders**. We can also use Swift's Smart KeyPaths to use in the expressions:
 ```swift
-let personJSON = CoreStore.queryAttributes(
+let personJSON = try CoreStore.queryAttributes(
    From<MyPersonEntity>()
        .select(.attribute(\.age), .count(\.age, as: "count"))
        .groupBy(\.age)
@@ -1491,16 +1432,35 @@ A couple of examples, `ListMonitor`:
 These are all implemented with `CustomDebugStringConvertible.debugDescription`, so they work with lldb's `po` command as well.

 ## Observing changes and notifications
-> (unavailable on macOS versions below 10.12)

 CoreStore provides type-safe wrappers for observing managed objects:

 - `ObjectMonitor`: use to monitor changes to a single `NSManagedObject` or `CoreStoreObject` instance (instead of Key-Value Observing)
 - `ListMonitor`: use to monitor changes to a list of `NSManagedObject` or `CoreStoreObject` instances (instead of `NSFetchedResultsController`)

+### Observe a single property
+To get notifications for single property changes in an object, there are two methods depending on the object's base class.
+
+- For `NSManagedObject` subclasses: Use the standard KVO method:
+```swift
+let observer = person.observe(\.age, options: [.new]) { (person, change)
+    print("Happy \(change.newValue)th birthday!")
+}
+```
+
+- For `CoreStoreObject` subclasses: Call the `observe(...)` method directly on the property. You'll notice that the API itself is a bit similar to the KVO method:
+```swift
+let observer = person.age.observe(options: [.new]) { (person, change)
+    print("Happy \(change.newValue)th birthday!")
+}
+```
+
+For both methods, you will need to keep a reference to the returned `observer` for the duration of the observation.  
+
+
 ### Observe a single object

-To observe an object, implement the `ObjectObserver` protocol and specify the `EntityType`:
+To observe an object itself as a whole, implement the `ObjectObserver` protocol and specify the `EntityType`:
 ```swift
 class MyViewController: UIViewController, ObjectObserver {
    func objectMonitor(monitor: ObjectMonitor<MyPersonEntity>, willUpdateObject object: MyPersonEntity) {
@@ -1654,14 +1614,13 @@ CoreStore.perform(
 <td><pre lang=objc>
 [CSCoreStore beginAsynchronous:^(CSAsynchronousDataTransaction *transaction) {
    // ...
-    [transaction commitWithCompletion:^(CSSaveResult *result) {
-        if (result.isSuccess) {
-            NSLog(@"Done");
-        }
-        else if (result.isFailure) {
-            NSLog(@"error: %@", result.error);
-        }
-    }];
+    [transaction 
+     commitWithSuccess:^{
+        NSLog(@"Done");
+     }
+     failure: ^(CSError *error) {
+        NSLog(@"error: %@", result.error);
+     }];
 }];
 </pre></td>
 </tr>
@@ -1796,7 +1755,7 @@ let keyPath: String = Dog.keyPath { $0.nickname }
 ```
 as well as `Where` and `OrderBy` clauses
 ```swift
-let puppies = CoreStore.fetchAll(
+let puppies = try CoreStore.fetchAll(
    From<Dog>()
        .where(\.age < 1)
        .orderBy(.ascending(\.age))
@@ -1841,8 +1800,9 @@ Once the version lock is set, any changes in the properties or to the model will

 # Installation
 - Requires:
-    - iOS 8 SDK and above
-    - Swift 4 (Xcode 9+)
+    - iOS 10 SDK and above
+    - Swift 5.0 (Xcode 10+)
+    - For previous Swift versions: [Swift 3.2](https://github.com/JohnEstropia/CoreStore/tree/4.2.3), [Swift 4.2](https://github.com/JohnEstropia/CoreStore/tree/6.2.1)
 - Dependencies:
    - *None*
 - Other notes:
@@ -1851,7 +1811,7 @@ Once the version lock is set, any changes in the properties or to the model will
 ### Install with CocoaPods
 In your `Podfile`, add
 ```
-pod 'CoreStore', '~> 5.0'
+pod 'CoreStore', '~> 6.3'
 ```
 and run 
 ```
@@ -1862,7 +1822,7 @@ This installs CoreStore as a framework. Declare `import CoreStore` in your swift
 ### Install with Carthage
 In your `Cartfile`, add
 ```
-github "JohnEstropia/CoreStore" >= 5.0.0
+github "JohnEstropia/CoreStore" >= 6.3.0
 ```
 and run 
 ```
@@ -1870,18 +1830,20 @@ carthage update
 ```
 This installs CoreStore as a framework. Declare `import CoreStore` in your swift file to use the library.

+#### Install with Swift Package Manager:
+```swift
+dependencies: [
+    .package(url: "https://github.com/JohnEstropia/CoreStore.git", from: "6.3.0"))
+]
+```
+Declare `import CoreStore` in your swift file to use the library.
+
 ### Install as Git Submodule
 ```
 git submodule add https://github.com/JohnEstropia/CoreStore.git <destination directory>
 ```
 Drag and drop **CoreStore.xcodeproj** to your project.

-#### To install as a framework:
-Drag and drop **CoreStore.xcodeproj** to your project.
-
-#### To include directly in your app module:
-Add all *.swift* files to your project.
-

 ### Objective-C support

--- a/Sources/AsynchronousDataTransaction.swift
+++ b/Sources/AsynchronousDataTransaction.swift
@@ -50,45 +50,11 @@ public final class AsynchronousDataTransaction: BaseDataTransaction {
    // MARK: - Result
    
    /**
-     The `Result` contains the success or failure information for a completed transaction
+     The `Result` contains the success or failure information for a completed transaction.
+     `Result<T>.success` indicates that the transaction succeeded, either because the save succeeded or because there were no changes to save. The associated `userInfo` is the value returned from the transaction closure.
+     `Result<T>.failure` indicates that the transaction either failed or was cancelled. The associated object for this value is a `CoreStoreError` enum value.
     */
-    public enum Result<T> {
-        
-        /**
-         `Result<T>.success` indicates that the transaction succeeded, either because the save succeeded or because there were no changes to save. The associated `userInfo` is the value returned from the transaction closure.
-         */
-        case success(userInfo: T)
-        
-        /**
-         `Result<T>.failure` indicates that the transaction either failed or was cancelled. The associated object for this value is a `CoreStoreError` enum value.
-         */
-        case failure(error: CoreStoreError)
-        
-        /**
-         Returns `true` if the result indicates `.success`, `false` if the result is `.failure`.
-         */
-        public var boolValue: Bool {
-            
-            switch self {
-                
-            case .success: return true
-            case .failure: return false
-            }
-        }
-        
-        
-        // MARK: Internal
-        
-        internal init(userInfo: T) {
-            
-            self = .success(userInfo: userInfo)
-        }
-        
-        internal init(error: CoreStoreError) {
-            
-            self = .failure(error: error)
-        }
-    }
+    public typealias Result<UserInfoType> = Swift.Result<UserInfoType, CoreStoreError>
    
    // MARK: -
    
@@ -212,67 +178,4 @@ public final class AsynchronousDataTransaction: BaseDataTransaction {
        group.wait()
        self.context.reset()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new auto-commiting methods `DataStack.perform(asynchronous:completion:)` or `DataStack.perform(asynchronous:success:failure:)`. Please read the documentation on the behavior of the new methods.")
-    public func commit(_ completion: @escaping (_ result: SaveResult) -> Void = { _ in }) {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to commit a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to commit a \(cs_typeName(self)) more than once."
-        )
-        self.autoCommit { (hasChanges, error) in
-            
-            if let error = error {
-                
-                completion(SaveResult(error))
-            }
-            else {
-                
-                completion(SaveResult(hasChanges: hasChanges))
-            }
-        }
-    }
-    
-    @available(*, deprecated, message: "Secondary tasks spawned from AsynchronousDataTransactions and SynchronousDataTransactions are no longer supported. ")
-    @discardableResult
-    public func beginSynchronous(_ closure: @escaping (_ transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to begin a child transaction from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to begin a child transaction from an already committed \(cs_typeName(self))."
-        )
-        let childTransaction = SynchronousDataTransaction(
-            mainContext: self.context,
-            queue: self.childTransactionQueue
-        )
-        childTransaction.transactionQueue.cs_sync {
-            
-            closure(childTransaction)
-            
-            if !childTransaction.isCommitted && childTransaction.hasChanges {
-                
-                CoreStore.log(
-                    .warning,
-                    message: "The closure for the \(cs_typeName(childTransaction)) completed without being committed. All changes made within the transaction were discarded."
-                )
-            }
-        }
-        switch childTransaction.result {
-            
-        case .none:                         return nil
-        case .some(let hasChanges, nil):    return SaveResult(hasChanges: hasChanges)
-        case .some(_, let error?):          return SaveResult(error)
-        }
-    }
 }
--- a/Sources/BaseDataTransaction+Importing.swift
+++ b/Sources/BaseDataTransaction+Importing.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - BaseDataTransaction

-public extension BaseDataTransaction {
+extension BaseDataTransaction {
    
    /**
     Creates an `ImportableObject` by importing from the specified import source.
@@ -151,7 +151,7 @@ public extension BaseDataTransaction {
                    return nil
                }
                
-                if let object = self.fetchOne(From(entityType), Where<D>(uniqueIDKeyPath, isEqualTo: uniqueIDValue)) {
+                if let object = try self.fetchOne(From(entityType), Where<D>(uniqueIDKeyPath, isEqualTo: uniqueIDValue)) {
                    
                    guard entityType.shouldUpdate(from: source, in: self) else {
                        
@@ -215,7 +215,8 @@ public extension BaseDataTransaction {
                importSourceByID = try autoreleasepool { try preProcess(importSourceByID) }

                var existingObjectsByID = Dictionary<D.UniqueIDType, D>()
-                self.fetchAll(From(entityType), Where<D>(entityType.uniqueIDKeyPath, isMemberOf: sortedIDs))?
+                try self
+                    .fetchAll(From(entityType), Where<D>(entityType.uniqueIDKeyPath, isMemberOf: sortedIDs))
                    .forEach { existingObjectsByID[$0.uniqueIDValue] = $0 }
              
                var processedObjectIDs = Set<D.UniqueIDType>()
--- a/Sources/BaseDataTransaction+Querying.swift
+++ b/Sources/BaseDataTransaction+Querying.swift
@@ -39,13 +39,13 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - returns: the number of `DynamicObject`s deleted
     */
    @discardableResult
-    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: DeleteClause...) -> Int? {
+    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: DeleteClause...) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to delete from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.deleteAll(from, deleteClauses)
+        return try self.context.deleteAll(from, deleteClauses)
    }
    
    /**
@@ -56,13 +56,13 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - returns: the number of `DynamicObject`s deleted
     */
    @discardableResult
-    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: [DeleteClause]) -> Int? {
+    public func deleteAll<D>(_ from: From<D>, _ deleteClauses: [DeleteClause]) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to delete from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.deleteAll(from, deleteClauses)
+        return try self.context.deleteAll(from, deleteClauses)
    }
    
    /**
@@ -74,14 +74,14 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - returns: the number of `DynamicObject`s deleted
     */
    @discardableResult
-    public func deleteAll<B: FetchChainableBuilderType>(_ clauseChain: B) -> Int? {
+    public func deleteAll<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to delete from a \(cs_typeName(self)) outside its designated queue."
        )
        
-        return self.context.deleteAll(clauseChain.from, clauseChain.fetchClauses)
+        return try self.context.deleteAll(clauseChain.from, clauseChain.fetchClauses)
    }
    
    
@@ -136,15 +136,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> D? {
+    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> D? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchOne(from, fetchClauses)
+        return try self.context.fetchOne(from, fetchClauses)
    }
    
    /**
@@ -152,15 +153,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> D? {
+    public func fetchOne<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> D? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchOne(from, fetchClauses)
+        return try self.context.fetchOne(from, fetchClauses)
    }
    
    /**
@@ -173,15 +175,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchChainableBuilderType`
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchChainableBuilderType`, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchOne<B: FetchChainableBuilderType>(_ clauseChain: B) -> B.ObjectType? {
+    public func fetchOne<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> B.ObjectType? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchOne(clauseChain)
+        return try self.context.fetchOne(clauseChain)
    }
    
    /**
@@ -189,15 +192,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> [D]? {
+    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> [D] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchAll(from, fetchClauses)
+        return try self.context.fetchAll(from, fetchClauses)
    }
    
    /**
@@ -205,15 +209,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> [D]? {
+    public func fetchAll<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> [D] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchAll(from, fetchClauses)
+        return try self.context.fetchAll(from, fetchClauses)
    }
    
    /**
@@ -226,15 +231,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchChainableBuilderType`
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchChainableBuilderType`, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchAll<B: FetchChainableBuilderType>(_ clauseChain: B) -> [B.ObjectType]? {
+    public func fetchAll<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> [B.ObjectType] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchAll(clauseChain)
+        return try self.context.fetchAll(clauseChain)
    }
    
    /**
@@ -242,15 +248,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchClause`s
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> Int? {
+    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchCount(from, fetchClauses)
+        return try self.context.fetchCount(from, fetchClauses)
    }
    
    /**
@@ -258,15 +265,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchClause`s
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> Int? {
+    public func fetchCount<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchCount(from, fetchClauses)
+        return try self.context.fetchCount(from, fetchClauses)
    }
    
    /**
@@ -279,15 +287,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchCount<B: FetchChainableBuilderType>(_ clauseChain: B) -> Int? {
+    public func fetchCount<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> Int {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchCount(clauseChain)
+        return try self.context.fetchCount(clauseChain)
    }
    
    /**
@@ -295,15 +304,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> NSManagedObjectID? {
+    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> NSManagedObjectID? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectID(from, fetchClauses)
+        return try self.context.fetchObjectID(from, fetchClauses)
    }
    
    /**
@@ -311,15 +321,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> NSManagedObjectID? {
+    public func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> NSManagedObjectID? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectID(from, fetchClauses)
+        return try self.context.fetchObjectID(from, fetchClauses)
    }
    
    /**
@@ -332,15 +343,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchChainableBuilderType`
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchChainableBuilderType`, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectID<B: FetchChainableBuilderType>(_ clauseChain: B) -> NSManagedObjectID? {
+    public func fetchObjectID<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> NSManagedObjectID? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectID(clauseChain)
+        return try self.context.fetchObjectID(clauseChain)
    }
    
    /**
@@ -348,15 +360,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> [NSManagedObjectID]? {
+    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> [NSManagedObjectID] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectIDs(from, fetchClauses)
+        return try self.context.fetchObjectIDs(from, fetchClauses)
    }
    
    /**
@@ -364,15 +377,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> [NSManagedObjectID]? {
+    public func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> [NSManagedObjectID] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectIDs(from, fetchClauses)
+        return try self.context.fetchObjectIDs(from, fetchClauses)
    }
    
    /**
@@ -385,15 +399,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func fetchObjectIDs<B: FetchChainableBuilderType>(_ clauseChain: B) -> [NSManagedObjectID]? {
+    public func fetchObjectIDs<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> [NSManagedObjectID] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.fetchObjectIDs(clauseChain)
+        return try self.context.fetchObjectIDs(clauseChain)
    }
    
    
@@ -407,15 +422,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter from: a `From` clause indicating the entity type
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - returns: the result of the the query, or `nil` if no match was found. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: QueryClause...) -> U? {
+    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: QueryClause...) throws -> U? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryValue(from, selectClause, queryClauses)
+        return try self.context.queryValue(from, selectClause, queryClauses)
    }
    
    /**
@@ -426,15 +442,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter from: a `From` clause indicating the entity type
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - returns: the result of the the query, or `nil` if no match was found. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: [QueryClause]) -> U? {
+    public func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: [QueryClause]) throws -> U? {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryValue(from, selectClause, queryClauses)
+        return try self.context.queryValue(from, selectClause, queryClauses)
    }
    
    /**
@@ -449,15 +466,16 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     )
     ```
     - parameter clauseChain: a `QueryChainableBuilderType` indicating the property/aggregate to fetch and the series of queries for the request.
-     - returns: the result of the the query as specified by the `QueryChainableBuilderType`
+     - returns: the result of the the query as specified by the `QueryChainableBuilderType`, or `nil` if no match was found.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryValue<B: QueryChainableBuilderType>(_ clauseChain: B) -> B.ResultType? where B.ResultType: QueryableAttributeType {
+    public func queryValue<B: QueryChainableBuilderType>(_ clauseChain: B) throws -> B.ResultType? where B.ResultType: QueryableAttributeType {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryValue(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
+        return try self.context.queryValue(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
    }
    
    /**
@@ -469,14 +487,15 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: QueryClause...) -> [[String: Any]]? {
+    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: QueryClause...) throws -> [[String: Any]] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryAttributes(from, selectClause, queryClauses)
+        return try self.context.queryAttributes(from, selectClause, queryClauses)
    }
    
    /**
@@ -488,14 +507,15 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: [QueryClause]) -> [[String: Any]]? {
+    public func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: [QueryClause]) throws -> [[String: Any]] {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryAttributes(from, selectClause, queryClauses)
+        return try self.context.queryAttributes(from, selectClause, queryClauses)
    }
    
    /**
@@ -520,14 +540,15 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
     ```
     - parameter clauseChain: a `QueryChainableBuilderType` indicating the properties to fetch and the series of queries for the request.
     - returns: the result of the the query as specified by the `QueryChainableBuilderType`
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public func queryAttributes<B: QueryChainableBuilderType>(_ clauseChain: B) -> [[String: Any]]? where B.ResultType == NSDictionary {
+    public func queryAttributes<B: QueryChainableBuilderType>(_ clauseChain: B) throws -> [[String: Any]] where B.ResultType == NSDictionary {
        
        CoreStore.assert(
            self.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.context.queryAttributes(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
+        return try self.context.queryAttributes(clauseChain.from, clauseChain.select, clauseChain.queryClauses)
    }
    
    
@@ -540,13 +561,4 @@ extension BaseDataTransaction: FetchableSource, QueryableSource {
        
        return self.context
    }
-    
-    
-    // MARK: Obsoleted
-    
-    @available(*, obsoleted: 3.1, renamed: "unsafeContext()")
-    public func internalContext() -> NSManagedObjectContext {
-        
-        fatalError()
-    }
 }
--- a/Sources/BaseDataTransaction.swift
+++ b/Sources/BaseDataTransaction.swift
@@ -223,7 +223,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func insertedObjects<D: DynamicObject>(_ entity: D.Type) -> Set<D> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access inserted objects from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -241,7 +241,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func insertedObjectIDs() -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access inserted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -260,7 +260,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func insertedObjectIDs<D: DynamicObject>(_ entity: D.Type) -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access inserted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -279,7 +279,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func updatedObjects<D: DynamicObject>(_ entity: D.Type) -> Set<D> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access updated objects from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -297,7 +297,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func updatedObjectIDs() -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access updated object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -316,7 +316,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func updatedObjectIDs<D: DynamicObject>(_ entity: D.Type) -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access updated object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -335,7 +335,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func deletedObjects<D: DynamicObject>(_ entity: D.Type) -> Set<D> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access deleted objects from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -354,7 +354,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func deletedObjectIDs() -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access deleted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -373,7 +373,7 @@ public /*abstract*/ class BaseDataTransaction {
    public func deletedObjectIDs<D: DynamicObject>(_ entity: D.Type) -> Set<NSManagedObjectID> {
        
        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
+            self.isRunningInAllowedQueue(),
            "Attempted to access deleted object IDs from a \(cs_typeName(self)) outside its designated queue."
        )
        CoreStore.assert(
@@ -442,49 +442,4 @@ public /*abstract*/ class BaseDataTransaction {
        
        self.context.reset()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use insertedObjects(_:) and pass the specific entity type")
-    public func insertedObjects() -> Set<NSManagedObject> {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to access inserted objects from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to access inserted objects from an already committed \(cs_typeName(self))."
-        )
-        return self.context.insertedObjects
-    }
-    
-    @available(*, deprecated, message: "Use updatedObjects(_:) and pass the specific entity type")
-    public func updatedObjects() -> Set<NSManagedObject> {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to access updated objects from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to access updated objects from an already committed \(cs_typeName(self))."
-        )
-        return self.context.updatedObjects
-    }
-    
-    @available(*, deprecated, message: "Use deletedObjects(_:) and pass the specific entity type")
-    public func deletedObjects() -> Set<NSManagedObject> {
-        
-        CoreStore.assert(
-            self.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to access deleted objects from a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.isCommitted,
-            "Attempted to access deleted objects from an already committed \(cs_typeName(self))."
-        )
-        return self.context.deletedObjects
-    }
 }
--- a/Sources/CSAsynchronousDataTransaction.swift
+++ b/Sources/CSAsynchronousDataTransaction.swift
@@ -156,41 +156,6 @@ public final class CSAsynchronousDataTransaction: CSBaseDataTransaction, CoreSto
        
        super.init(swiftValue)
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new -[CSAsynchronousDataTransaction commitWithSuccess:failure:] method.")
-    @objc
-    public func commitWithCompletion(_ completion: ((_ result: CSSaveResult) -> Void)?) {
-        
-        CoreStore.assert(
-            self.bridgeToSwift.transactionQueue.cs_isCurrentExecutionContext(),
-            "Attempted to commit a \(cs_typeName(self)) outside its designated queue."
-        )
-        CoreStore.assert(
-            !self.bridgeToSwift.isCommitted,
-            "Attempted to commit a \(cs_typeName(self)) more than once."
-        )
-        self.bridgeToSwift.commit { (result) in
-            
-            completion?(result.bridgeToObjectiveC)
-        }
-    }
-    
-    @available(*, deprecated, message: "Secondary tasks spawned from CSAsynchronousDataTransactions and CSSynchronousDataTransactions are no longer supported. ")
-    @objc
-    @discardableResult
-    public func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void) -> CSSaveResult? {
-        
-        return bridge {
-            
-            self.bridgeToSwift.beginSynchronous { (transaction) in
-                
-                closure(transaction.bridgeToObjectiveC)
-            }
-        }
-    }
 }


--- a/Sources/CSBaseDataTransaction+Querying.swift
+++ b/Sources/CSBaseDataTransaction+Querying.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSBaseDataTransaction

-public extension CSBaseDataTransaction {
+extension CSBaseDataTransaction {
    
    /**
     Fetches the `NSManagedObject` instance in the transaction's context from a reference created from a transaction or from a different managed object context.
@@ -93,7 +93,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.fetchOne(from, fetchClauses)
+        return (try? self.swiftTransaction.context.fetchOne(from, fetchClauses))?
+            .flatMap({ $0 })
    }
    
    /**
@@ -110,7 +111,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.fetchAll(from, fetchClauses)
+        return (try? self.swiftTransaction.context.fetchAll(from, fetchClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -127,9 +129,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context
-            .fetchCount(from, fetchClauses)
-            .flatMap { NSNumber(value: $0) }
+        return (try? self.swiftTransaction.context.fetchCount(from, fetchClauses))
+            .flatMap({ NSNumber(value: $0) })
    }
    
    /**
@@ -146,7 +147,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to fetch from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.fetchObjectID(from, fetchClauses)
+        return (try? self.swiftTransaction.context.fetchObjectID(from, fetchClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -166,7 +168,8 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.queryValue(from, selectClause, queryClauses)
+        return (try? self.swiftTransaction.context.queryValue(from, selectClause, queryClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -186,6 +189,7 @@ public extension CSBaseDataTransaction {
            self.swiftTransaction.isRunningInAllowedQueue(),
            "Attempted to query from a \(cs_typeName(self)) outside its designated queue."
        )
-        return self.swiftTransaction.context.queryAttributes(from, selectClause, queryClauses)
+        return (try? self.swiftTransaction.context.queryAttributes(from, selectClause, queryClauses))
+            .flatMap({ $0 })
    }
 }
--- a/Sources/CSBaseDataTransaction.swift
+++ b/Sources/CSBaseDataTransaction.swift
@@ -251,28 +251,4 @@ public class CSBaseDataTransaction: NSObject {
        self.swiftTransaction = swiftValue
        super.init()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use -[insertedObjectsOfType:] and pass the specific entity class")
-    @objc
-    public func insertedObjects() -> Set<NSManagedObject> {
-        
-        return self.swiftTransaction.insertedObjects()
-    }
-    
-    @available(*, deprecated, message: "Use -[updatedObjectsOfType:] and pass the specific entity class")
-    @objc
-    public func updatedObjects() -> Set<NSManagedObject> {
-        
-        return self.swiftTransaction.updatedObjects()
-    }
-    
-    @available(*, deprecated, message: "Use -[deletedObjectsOfType:] and pass the specific entity class")
-    @objc
-    public func deletedObjects() -> Set<NSManagedObject> {
-        
-        return self.swiftTransaction.deletedObjects()
-    }
 }
--- a/Sources/CSCoreStore+Migrating.swift
+++ b/Sources/CSCoreStore+Migrating.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Asynchronously adds a `CSInMemoryStore` to the `defaultStack`. Migrations are also initiated by default.
--- a/Sources/CSCoreStore+Observing.swift
+++ b/Sources/CSCoreStore+Observing.swift
@@ -30,7 +30,7 @@ import CoreData
 // MARK: - CSCoreStore

@available(macOS 10.12, *)
-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Using the `defaultStack`, creates an `CSObjectMonitor` for the specified `NSManagedObject`. Multiple `CSObjectObserver`s may then register themselves to be notified when changes are made to the `NSManagedObject`.
--- a/Sources/CSCoreStore+Querying.swift
+++ b/Sources/CSCoreStore+Querying.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Using the `defaultStack`, fetches the `NSManagedObject` instance in the transaction's context from a reference created from a transaction or from a different managed object context.
--- a/Sources/CSCoreStore+Setup.swift
+++ b/Sources/CSCoreStore+Setup.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Returns the `defaultStack`'s model version. The version string is the same as the name of the version-specific .xcdatamodeld file.
@@ -125,21 +125,4 @@ public extension CSCoreStore {
        
        return self.defaultStack.addSQLiteStorageAndWait(storage, error: error)
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new +entityTypesByNameForType: method passing `[NSManagedObject class]` as argument.")
-    @objc
-    public static var entityClassesByName: [EntityName: NSManagedObject.Type] {
-        
-        return CoreStore.entityTypesByName
-    }
-    
-    @available(*, deprecated, message: "Use the new +entityTypesByNameForType: method passing `[NSManagedObject class]` as argument.")
-    @objc
-    public static func entityClassWithName(_ name: EntityName) -> NSManagedObject.Type? {
-        
-        return CoreStore.entityTypesByName[name]
-    }
 }
--- a/Sources/CSCoreStore+Transaction.swift
+++ b/Sources/CSCoreStore+Transaction.swift
@@ -28,7 +28,7 @@ import Foundation

 // MARK: - CSCoreStore

-public extension CSCoreStore {
+extension CSCoreStore {
    
    /**
     Using the `defaultStack`, begins a transaction asynchronously where `NSManagedObject` creates, updates, and deletes can be made.
@@ -45,7 +45,7 @@ public extension CSCoreStore {
     Using the `defaultStack`, begins a transaction synchronously where `NSManagedObject` creates, updates, and deletes can be made.
     
     - parameter closure: the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
-     - returns: a `CSSaveResult` value indicating success or failure, or `nil` if the transaction was not comitted synchronously
+     - returns: `YES` if the commit succeeded, `NO` if the commit failed. If `NO`, the `error` argument will hold error information.
     */
    @objc
    public static func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void, error: NSErrorPointer) -> Bool {
@@ -91,15 +91,4 @@ public extension CSCoreStore {
        
        CoreStore.refreshAndMergeAllObjects()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new +[CSCoreStore beginSynchronous:error:] API that reports failure using an error instance.")
-    @objc
-    @discardableResult
-    public static func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void) -> CSSaveResult? {
-        
-        return self.defaultStack.beginSynchronous(closure)
-    }
 }
--- a/Sources/CSDataStack+Migrating.swift
+++ b/Sources/CSDataStack+Migrating.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSDataStack

-public extension CSDataStack {
+extension CSDataStack {
    
    /**
     Asynchronously adds a `CSInMemoryStore` to the stack. Migrations are also initiated by default.
--- a/Sources/CSDataStack+Observing.swift
+++ b/Sources/CSDataStack+Observing.swift
@@ -30,7 +30,7 @@ import CoreData
 // MARK: - CSDataStack

@available(macOS 10.12, *)
-public extension CSDataStack {
+extension CSDataStack {
    
    /**
     Creates a `CSObjectMonitor` for the specified `NSManagedObject`. Multiple `ObjectObserver`s may then register themselves to be notified when changes are made to the `NSManagedObject`.
@@ -68,7 +68,7 @@ public extension CSDataStack {
            sectionBy: nil,
            applyFetchClauses: { (fetchRequest) in
                
-                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest as! NSFetchRequest<NSFetchRequestResult>) }
+                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
            }
        ).bridgeToObjectiveC
    }
@@ -97,7 +97,7 @@ public extension CSDataStack {
            sectionBy: nil,
            applyFetchClauses: { (fetchRequest) in
                
-                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest as! NSFetchRequest<NSFetchRequestResult>) }
+                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
            },
            createAsynchronously: {
                
@@ -131,7 +131,7 @@ public extension CSDataStack {
            sectionBy: sectionBy.bridgeToSwift,
            applyFetchClauses: { (fetchRequest) in
                
-                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest as! NSFetchRequest<NSFetchRequestResult>) }
+                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
            }
        ).bridgeToObjectiveC
    }
@@ -160,7 +160,7 @@ public extension CSDataStack {
            sectionBy: sectionBy.bridgeToSwift,
            applyFetchClauses: { (fetchRequest) in
                
-                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest as! NSFetchRequest<NSFetchRequestResult>) }
+                fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
            },
            createAsynchronously: {
                
--- a/Sources/CSDataStack+Querying.swift
+++ b/Sources/CSDataStack+Querying.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CSDataStack

-public extension CSDataStack {
+extension CSDataStack {
    
    /**
     Fetches the `NSManagedObject` instance in the transaction's context from a reference created from a transaction or from a different managed object context.
@@ -93,7 +93,8 @@ public extension CSDataStack {
            Thread.isMainThread,
            "Attempted to fetch from a \(cs_typeName(self)) outside the main thread."
        )
-        return self.bridgeToSwift.mainContext.fetchOne(from, fetchClauses)
+        return (try? self.bridgeToSwift.mainContext.fetchOne(from, fetchClauses))?
+            .flatMap({ $0 })
    }
    
    /**
@@ -110,7 +111,8 @@ public extension CSDataStack {
            Thread.isMainThread,
            "Attempted to fetch from a \(cs_typeName(self)) outside the main thread."
        )
-        return self.bridgeToSwift.mainContext.fetchAll(from, fetchClauses)
+        return (try? self.bridgeToSwift.mainContext.fetchAll(from, fetchClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -127,9 +129,8 @@ public extension CSDataStack {
            Thread.isMainThread,
            "Attempted to fetch from a \(cs_typeName(self)) outside the main thread."
        )
-        return self.bridgeToSwift.mainContext
-            .fetchCount(from, fetchClauses)
-            .flatMap { NSNumber(value: $0) }
+        return (try? self.bridgeToSwift.mainContext.fetchCount(from, fetchClauses))
+            .flatMap({ NSNumber(value: $0) })
    }
    
    /**
@@ -146,7 +147,8 @@ public extension CSDataStack {
            Thread.isMainThread,
            "Attempted to fetch from a \(cs_typeName(self)) outside the main thread."
        )
-        return self.bridgeToSwift.mainContext.fetchObjectID(from, fetchClauses)
+        return (try? self.bridgeToSwift.mainContext.fetchObjectID(from, fetchClauses))?
+            .flatMap({ $0 })
    }
    
    /**
@@ -163,7 +165,8 @@ public extension CSDataStack {
            Thread.isMainThread,
            "Attempted to fetch from a \(cs_typeName(self)) outside the main thread."
        )
-        return self.bridgeToSwift.mainContext.fetchObjectIDs(from, fetchClauses)
+        return (try? self.bridgeToSwift.mainContext.fetchObjectIDs(from, fetchClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -183,7 +186,8 @@ public extension CSDataStack {
            Thread.isMainThread,
            "Attempted to query from a \(cs_typeName(self)) outside the main thread."
        )
-        return self.bridgeToSwift.mainContext.queryValue(from, selectClause, queryClauses)
+        return (try? self.bridgeToSwift.mainContext.queryValue(from, selectClause, queryClauses))
+            .flatMap({ $0 })
    }
    
    /**
@@ -203,6 +207,7 @@ public extension CSDataStack {
            Thread.isMainThread,
            "Attempted to query from a \(cs_typeName(self)) outside the main thread."
        )
-        return self.bridgeToSwift.mainContext.queryAttributes(from, selectClause, queryClauses)
+        return (try? self.bridgeToSwift.mainContext.queryAttributes(from, selectClause, queryClauses))
+            .flatMap({ $0 })
    }
 }
--- a/Sources/CSDataStack+Transaction.swift
+++ b/Sources/CSDataStack+Transaction.swift
@@ -28,7 +28,7 @@ import Foundation

 // MARK: - CSDataStack

-public extension CSDataStack {
+extension CSDataStack {
    
    /**
     Begins a transaction asynchronously where `NSManagedObject` creates, updates, and deletes can be made.
@@ -131,21 +131,4 @@ public extension CSDataStack {
        
        self.bridgeToSwift.refreshAndMergeAllObjects()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new -[CSDataStack beginSynchronous:error:] API that reports failure using an error instance.")
-    @objc
-    @discardableResult
-    public func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void) -> CSSaveResult? {
-        
-        return bridge {
-            
-            self.bridgeToSwift.beginSynchronous { (transaction) in
-                
-                closure(transaction.bridgeToObjectiveC)
-            }
-        }
-    }
 }
--- a/Sources/CSDataStack.swift
+++ b/Sources/CSDataStack.swift
@@ -50,7 +50,7 @@ public final class CSDataStack: NSObject, CoreStoreObjectiveCType {
     Initializes a `CSDataStack` from the model with the specified `modelName` in the specified `bundle`.
     
     - parameter xcodeModelName: the name of the (.xcdatamodeld) model file. If not specified, the application name (CFBundleName) will be used if it exists, or "CoreData" if it the bundle name was not set.
-     - parameter bundle: an optional bundle to load models from. If not specified, the main bundle will be used.
+     - parameter bundle: an optional bundle to load .xcdatamodeld models from. If not specified, the main bundle will be used.
     - parameter versionChain: the version strings that indicate the sequence of model versions to be used as the order for progressive migrations. If not specified, will default to a non-migrating data stack.
     */
    @objc
@@ -204,60 +204,6 @@ public final class CSDataStack: NSObject, CoreStoreObjectiveCType {
        self.bridgeToSwift = swiftValue
        super.init()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the -[initWithXcodeModelName:bundle:versionChain:] initializer.")
-    @objc
-    public convenience init(modelName: XcodeDataModelFileName?, bundle: Bundle?, versionChain: [String]?) {
-        
-        self.init(
-            DataStack(
-                xcodeModelName: modelName ?? DataStack.applicationName,
-                bundle: bundle ?? Bundle.main,
-                migrationChain: versionChain.flatMap { MigrationChain($0) } ?? nil
-            )
-        )
-    }
-    
-    @available(*, deprecated, message: "Use the -[initWithModelName:bundle:versionChain:] initializer.")
-    @objc
-    public convenience init(model: NSManagedObjectModel, versionChain: [String]?) {
-        
-        self.init(
-            DataStack(
-                model: model,
-                migrationChain: versionChain.flatMap { MigrationChain($0) } ?? nil
-            )
-        )
-    }
-    
-    @available(*, deprecated, message: "Use the -[initWithModelName:bundle:versionTree:] initializer.")
-    @objc
-    public convenience init(model: NSManagedObjectModel, versionTree: [String]?) {
-        
-        self.init(
-            DataStack(
-                model: model,
-                migrationChain: versionTree.flatMap { MigrationChain($0) } ?? nil
-            )
-        )
-    }
-    
-    @available(*, deprecated, message: "Use the new -entityTypesByNameForType: method passing `[NSManagedObject class]` as argument.")
-    @objc
-    public var entityClassesByName: [EntityName: NSManagedObject.Type] {
-        
-        return self.bridgeToSwift.entityTypesByName
-    }
-    
-    @available(*, deprecated, message: "Use the new -entityTypesByNameForType: method passing `[NSManagedObject class]` as argument.")
-    @objc
-    public func entityClassWithName(_ name: EntityName) -> NSManagedObject.Type? {
-        
-        return self.bridgeToSwift.entityTypesByName[name]
-    }
 }


--- a/Sources/CSError.swift
+++ b/Sources/CSError.swift
@@ -217,6 +217,17 @@ extension CoreStoreError: CoreStoreSwiftType, _ObjectiveCBridgeableError {
                return
            }
            self = .progressiveMigrationRequired(localStoreURL: localStoreURL)
+
+        case .asynchronousMigrationRequired:
+            guard
+                let localStoreURL = info["localStoreURL"] as? URL,
+                case let nsError as NSError = info["NSError"]
+                else {
+
+                    self = .unknown
+                    return
+            }
+            self = .asynchronousMigrationRequired(localStoreURL: localStoreURL, NSError: nsError)
            
        case .internalError:
            guard case let nsError as NSError = info["NSError"] else {
@@ -236,6 +247,14 @@ extension CoreStoreError: CoreStoreSwiftType, _ObjectiveCBridgeableError {
            
        case .userCancelled:
            self = .userCancelled
+
+        case .persistentStoreNotFound:
+            guard let entity = info["entity"] as? DynamicObject.Type else {
+
+                self = .unknown
+                return
+            }
+            self = .persistentStoreNotFound(entity: entity)
        }
    }
 }
@@ -243,7 +262,7 @@ extension CoreStoreError: CoreStoreSwiftType, _ObjectiveCBridgeableError {

 // MARK: Internal

-internal extension Error {
+extension Error {
    
    internal var bridgeToSwift: CoreStoreError {
        
--- a/Sources/CSListMonitor.swift
+++ b/Sources/CSListMonitor.swift
@@ -132,7 +132,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func hasObjectsInSection(_ section: Int) -> Bool {
        
-        return self.bridgeToSwift.hasObjectsInSection(section)
+        return self.bridgeToSwift.hasObjects(in: section)
    }
    
    /**
@@ -155,7 +155,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func objectsInSection(_ section: Int) -> [NSManagedObject] {
        
-        return self.bridgeToSwift.objectsInSection(section)
+        return self.bridgeToSwift.objects(in: section)
    }
    
    /**
@@ -167,7 +167,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func objectsInSafeSection(safeSectionIndex section: Int) -> [NSManagedObject]? {
        
-        return self.bridgeToSwift.objectsInSection(safeSectionIndex: section)
+        return self.bridgeToSwift.objects(safelyIn: section)
    }

    /**
@@ -201,7 +201,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func numberOfObjectsInSection(_ section: Int) -> Int {
        
-        return self.bridgeToSwift.numberOfObjectsInSection(section)
+        return self.bridgeToSwift.numberOfObjects(in: section)
    }
    
    /**
@@ -214,7 +214,7 @@ public final class CSListMonitor: NSObject {
    public func numberOfObjectsInSafeSection(safeSectionIndex section: Int) -> NSNumber? {
        
        return self.bridgeToSwift
-            .numberOfObjectsInSection(safeSectionIndex: section)
+            .numberOfObjects(safelyIn: section)
            .flatMap { NSNumber(value: $0) }
    }
    
@@ -227,7 +227,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func sectionInfoAtIndex(_ section: Int) -> NSFetchedResultsSectionInfo {
        
-        return self.bridgeToSwift.sectionInfoAtIndex(section)
+        return self.bridgeToSwift.sectionInfo(at: section)
    }
    
    /**
@@ -239,7 +239,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func sectionInfoAtSafeSectionIndex(safeSectionIndex section: Int) -> NSFetchedResultsSectionInfo? {
        
-        return self.bridgeToSwift.sectionInfoAtIndex(safeSectionIndex: section)
+        return self.bridgeToSwift.sectionInfo(safelyAt: section)
    }
    
    /**
@@ -263,7 +263,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func targetSectionForSectionIndexTitle(title: String, index: Int) -> Int {
        
-        return self.bridgeToSwift.targetSectionForSectionIndex(title: title, index: index)
+        return self.bridgeToSwift.targetSection(forSectionIndexTitle: title, at: index)
    }
    
    /**
@@ -287,7 +287,7 @@ public final class CSListMonitor: NSObject {
    public func indexOf(_ object: NSManagedObject) -> NSNumber? {
        
        return self.bridgeToSwift
-            .indexOf(object)
+            .index(of: object)
            .flatMap { NSNumber(value: $0) }
    }
    
@@ -300,7 +300,7 @@ public final class CSListMonitor: NSObject {
    @objc
    public func indexPathOf(_ object: NSManagedObject) -> IndexPath? {
        
-        return self.bridgeToSwift.indexPathOf(object)
+        return self.bridgeToSwift.indexPath(of: object)
    }
    
    
@@ -495,14 +495,15 @@ public final class CSListMonitor: NSObject {
     
     `refetch(...)` broadcasts `listMonitorWillRefetch(...)` to its observers immediately, and then `listMonitorDidRefetch(...)` after the new fetch request completes.
     
-     - parameter fetchClauses: a series of `FetchClause` instances for fetching the object list. Accepts `Where`, `OrderBy`, and `Tweak` clauses. Note that only specified clauses will be changed; unspecified clauses will use previous values.
+     - parameter fetchClauses: a series of `FetchClause` instances for fetching the object list. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
+     - Important: Starting CoreStore 4.0, all `CSFetchClause`s required by the `CSListMonitor` should be provided in the arguments list of `refetch(...)`.
     */
    @objc
    public func refetch(_ fetchClauses: [CSFetchClause]) {
        
        self.bridgeToSwift.refetch { (fetchRequest) in
            
-            fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest as! NSFetchRequest<NSFetchRequestResult>) }
+            fetchClauses.forEach { $0.applyToFetchRequest(fetchRequest) }
        }
    }
    
--- a/Sources/CSMigrationResult.swift
+++ b/Sources/CSMigrationResult.swift
@@ -43,7 +43,7 @@ public final class CSMigrationResult: NSObject, CoreStoreObjectiveCType {
    @objc
    public var isSuccess: Bool {
        
-        return self.bridgeToSwift.isSuccess
+        return (try? self.bridgeToSwift.get()) != nil
    }
    
    /**
@@ -52,7 +52,7 @@ public final class CSMigrationResult: NSObject, CoreStoreObjectiveCType {
    @objc
    public var isFailure: Bool {
        
-        return !self.bridgeToSwift.isSuccess
+        return !self.isSuccess
    }
    
    /**
@@ -173,7 +173,7 @@ public final class CSMigrationResult: NSObject, CoreStoreObjectiveCType {

 // MARK: - MigrationResult

-extension MigrationResult: CoreStoreSwiftType {
+extension MigrationResult {
    
    // MARK: CoreStoreSwiftType
    
--- a/Sources/CSSQliteStore.swift
+++ b/Sources/CSSQliteStore.swift
@@ -191,23 +191,6 @@ public final class CSSQLiteStore: NSObject, CSLocalStorage, CoreStoreObjectiveCT
        self.bridgeToSwift = swiftValue
        super.init()
    }
-    
-    
-    // MARK: Obsoleted
-    
-    @available(*, obsoleted: 3.1, message: "The `mappingModelBundles` argument of this method is ignored. Use the new -[CSSQLiteStore initWithFileURL:configuration:localStorageOptions:]) initializer instead.")
-    @objc
-    public convenience init(fileURL: URL, configuration: ModelConfiguration, mappingModelBundles: [Bundle]?, localStorageOptions: Int) {
-        
-        fatalError()
-    }
-    
-    @available(*, obsoleted: 3.1, message: "The `mappingModelBundles` argument of this method is ignored. Use the new -[CSSQLiteStore initWithFileName:configuration:localStorageOptions:]) initializer instead.")
-    @objc
-    public convenience init(fileName: String, configuration: ModelConfiguration, mappingModelBundles: [Bundle]?, localStorageOptions: Int) {
-        
-        fatalError()
-    }
 }


--- a/Sources/CSSaveResult.swift
+++ b/Sources/CSSaveResult.swift
@@ -1,147 +0,0 @@
-//
-//  CSSaveResult.swift
-//  CoreStore
-//
-//  Copyright © 2018 John Rommel Estropia
-//
-//  Permission is hereby granted, free of charge, to any person obtaining a copy
-//  of this software and associated documentation files (the "Software"), to deal
-//  in the Software without restriction, including without limitation the rights
-//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-//  copies of the Software, and to permit persons to whom the Software is
-//  furnished to do so, subject to the following conditions:
-//
-//  The above copyright notice and this permission notice shall be included in all
-//  copies or substantial portions of the Software.
-//
-//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-//  SOFTWARE.
-//
-
-import Foundation
-import CoreData
-
-
-// MARK: - CSSaveResult
-
-@available(*, deprecated, message: "Use APIs that report failures with `CSError`s instead.")
-@objc
-public final class CSSaveResult: NSObject, CoreStoreObjectiveCType {
-    
-    @objc
-    public var isSuccess: Bool {
-        
-        return self.bridgeToSwift.boolValue
-    }
-    
-    @objc
-    public var isFailure: Bool {
-        
-        return !self.bridgeToSwift.boolValue
-    }
-    
-    @objc
-    public var hasChanges: Bool {
-        
-        guard case .success(let hasChanges) = self.bridgeToSwift else {
-            
-            return false
-        }
-        return hasChanges
-    }
-    
-    @objc
-    public var error: NSError? {
-        
-        guard case .failure(let error) = self.bridgeToSwift else {
-            
-            return nil
-        }
-        return error.bridgeToObjectiveC
-    }
-    
-    @objc
-    public func handleSuccess(_ success: (_ hasChanges: Bool) -> Void, failure: (_ error: NSError) -> Void) {
-        
-        switch self.bridgeToSwift {
-            
-        case .success(let hasChanges):
-            success(hasChanges)
-            
-        case .failure(let error):
-            failure(error.bridgeToObjectiveC)
-        }
-    }
-    
-    @objc
-    public func handleSuccess(_ success: (_ hasChanges: Bool) -> Void) {
-        
-        guard case .success(let hasChanges) = self.bridgeToSwift else {
-            
-            return
-        }
-        success(hasChanges)
-    }
-    
-    @objc
-    public func handleFailure(_ failure: (_ error: NSError) -> Void) {
-        
-        guard case .failure(let error) = self.bridgeToSwift else {
-                
-            return
-        }
-        failure(error.bridgeToObjectiveC)
-    }
-    
-    
-    // MARK: NSObject
-    
-    public override var hash: Int {
-        
-        return self.bridgeToSwift.hashValue
-    }
-    
-    public override func isEqual(_ object: Any?) -> Bool {
-        
-        guard let object = object as? CSSaveResult else {
-            
-            return false
-        }
-        return self.bridgeToSwift == object.bridgeToSwift
-    }
-    
-    public override var description: String {
-        
-        return "(\(String(reflecting: type(of: self)))) \(self.bridgeToSwift.coreStoreDumpString)"
-    }
-    
-    
-    // MARK: CoreStoreObjectiveCType
-    
-    public let bridgeToSwift: SaveResult
-    
-    public required init(_ swiftValue: SaveResult) {
-        
-        self.bridgeToSwift = swiftValue
-        super.init()
-    }
-}
-
-
-// MARK: - SaveResult
-
-@available(*, deprecated, message: "Use the new DataStack.perform(asynchronous:...) and DataStack.perform(synchronous:...) family of APIs")
-extension SaveResult: CoreStoreSwiftType {
-    
-    // MARK: CoreStoreSwiftType
-    
-    public var bridgeToObjectiveC: CSSaveResult {
-        
-        return CSSaveResult(self)
-    }
-}
--- a/Sources/CSSetupResult.swift
+++ b/Sources/CSSetupResult.swift
@@ -177,7 +177,7 @@ public final class CSSetupResult: NSObject {

 // MARK: - SetupResult

-extension SetupResult where T: CoreStoreSwiftType, T.ObjectiveCType: CSStorageInterface {
+extension SetupResult where Success: StorageInterface, Success: CoreStoreSwiftType, Success.ObjectiveCType: CSStorageInterface, Failure == CoreStoreError {
    
    // MARK: CoreStoreSwiftType
    
--- a/Sources/CSSynchronousDataTransaction.swift
+++ b/Sources/CSSynchronousDataTransaction.swift
@@ -143,33 +143,6 @@ public final class CSSynchronousDataTransaction: CSBaseDataTransaction, CoreStor
        
        super.init(swiftValue)
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new -[CSSynchronousDataTransaction commitAndWaitWithError:] method")
-    @objc
-    public func commitAndWait() -> CSSaveResult {
-        
-        return bridge {
-            
-            self.bridgeToSwift.commitAndWait()
-        }
-    }
-    
-    @available(*, deprecated, message: "Secondary tasks spawned from CSAsynchronousDataTransactions and CSSynchronousDataTransactions are no longer supported. ")
-    @objc
-    @discardableResult
-    public func beginSynchronous(_ closure: @escaping (_ transaction: CSSynchronousDataTransaction) -> Void) -> CSSaveResult? {
-        
-        return bridge {
-            
-            self.bridgeToSwift.beginSynchronous { (transaction) in
-                
-                closure(transaction.bridgeToObjectiveC)
-            }
-        }
-    }
 }


--- a/Sources/CSUnsafeDataTransaction.swift
+++ b/Sources/CSUnsafeDataTransaction.swift
@@ -203,51 +203,6 @@ public final class CSUnsafeDataTransaction: CSBaseDataTransaction, CoreStoreObje
        
        super.init(swiftValue)
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, renamed: "unsafeContext()")
-    @objc
-    public var internalContext: NSManagedObjectContext {
-        
-        return self.bridgeToSwift.context
-    }
-    
-    @available(*, deprecated, message: "Use the new -[CSUnsafeDataTransaction commitWithSuccess:failure:] method")
-    @objc
-    public func commit(_ completion: ((_ result: CSSaveResult) -> Void)?) {
-        
-        self.bridgeToSwift.context.saveAsynchronouslyWithCompletion { (hasChanges, error) in
-            
-            defer {
-                
-                withExtendedLifetime(self, {})
-            }
-            if let error = error {
-                
-                completion?(SaveResult(error).bridgeToObjectiveC)
-            }
-            else {
-                
-                completion?(SaveResult(hasChanges: hasChanges).bridgeToObjectiveC)
-            }
-        }
-    }
-    
-    @available(*, deprecated, message: "Use the new -[CSUnsafeDataTransaction commitAndWaitWithError:] method")
-    @objc
-    public func commitAndWait() -> CSSaveResult {
-        
-        return bridge { () -> SaveResult in
-            
-            switch self.bridgeToSwift.context.saveSynchronously(waitForMerge: true) {
-                
-            case (let hasChanges, nil): return SaveResult(hasChanges: hasChanges)
-            case (_, let error?):       return SaveResult(error)
-            }
-        }
-    }
 }


--- a/Sources/CoreStore+CustomDebugStringConvertible.swift
+++ b/Sources/CoreStore+CustomDebugStringConvertible.swift
@@ -137,6 +137,10 @@ extension CoreStoreError: CustomDebugStringConvertible, CoreStoreDebugStringConv
        case .progressiveMigrationRequired(let localStoreURL):
            firstLine = ".progressiveMigrationRequired"
            info.append(("localStoreURL", localStoreURL))
+
+        case .asynchronousMigrationRequired(let localStoreURL):
+            firstLine = ".asynchronousMigrationRequired"
+            info.append(("localStoreURL", localStoreURL))
            
        case .internalError(let NSError):
            firstLine = ".internalError"
@@ -148,6 +152,10 @@ extension CoreStoreError: CustomDebugStringConvertible, CoreStoreDebugStringConv
            
        case .userCancelled:
            firstLine = ".userCancelled"
+
+        case .persistentStoreNotFound(let entity):
+            firstLine = ".persistentStoreNotFound"
+            info.append(("entity", entity))
        }
        
        return createFormattedString(
@@ -158,6 +166,30 @@ extension CoreStoreError: CustomDebugStringConvertible, CoreStoreDebugStringConv
 }


+// MARK: - CoreStoreObject
+
+extension CoreStoreObject: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
+    
+    // MARK: CustomDebugStringConvertible
+    
+    public var debugDescription: String {
+        
+        return formattedDebugDescription(self)
+    }
+    
+    
+    // MARK: CoreStoreDebugStringConvertible
+    
+    public var coreStoreDumpString: String {
+        
+        return createFormattedString(
+            "(", ")",
+            ("rawObject", self.rawObject as Any)
+        )
+    }
+}
+
+
 // MARK: - CoreStoreSchema

 extension CoreStoreSchema: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
@@ -292,37 +324,6 @@ extension GroupBy: CustomDebugStringConvertible, CoreStoreDebugStringConvertible
 }


-#if os(iOS) || os(macOS)
-
-// MARK: - ICloudStore
-
-extension ICloudStore: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
-    
-    // MARK: CustomDebugStringConvertible
-    
-    public var debugDescription: String {
-        
-        return formattedDebugDescription(self)
-    }
-    
-    
-    // MARK: CoreStoreDebugStringConvertible
-    
-    public var coreStoreDumpString: String {
-        
-        return createFormattedString(
-            "(", ")",
-            ("configuration", self.configuration as Any),
-            ("storeOptions", self.storeOptions as Any),
-            ("cacheFileURL", self.cacheFileURL),
-            ("cloudStorageOptions", self.cloudStorageOptions)
-        )
-    }
-}
-    
-#endif
-
-
 // MARK: - InMemoryStore

 extension InMemoryStore: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
@@ -402,9 +403,16 @@ extension UnsafeDataModelSchema: CustomDebugStringConvertible, CoreStoreDebugStr
 // MARK: - ListMonitor

@available(macOS 10.12, *)
-private struct CoreStoreFetchedSectionInfoWrapper: CoreStoreDebugStringConvertible {
+fileprivate struct CoreStoreFetchedSectionInfoWrapper: CoreStoreDebugStringConvertible {
    
-    let sectionInfo: NSFetchedResultsSectionInfo
+    // MARK: CustomDebugStringConvertible
+    
+    var debugDescription: String {
+        
+        return formattedDebugDescription(self)
+    }
+    
+    // MARK: CoreStoreDebugStringConvertible
    
    var coreStoreDumpString: String {
        
@@ -414,6 +422,10 @@ private struct CoreStoreFetchedSectionInfoWrapper: CoreStoreDebugStringConvertib
            ("indexTitle", self.sectionInfo.indexTitle as Any)
        )
    }
+    
+    // MARK: FilePrivate
+    
+    let sectionInfo: NSFetchedResultsSectionInfo
 }

@available(macOS 10.12, *)
@@ -545,41 +557,7 @@ extension MigrationChain: CustomDebugStringConvertible, CoreStoreDebugStringConv

 // MARK: - MigrationType

-extension MigrationResult: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
-    
-    // MARK: CustomDebugStringConvertible
-    
-    public var debugDescription: String {
-        
-        return formattedDebugDescription(self)
-    }
-    
-    
-    // MARK: CoreStoreDebugStringConvertible
-    
-    public var coreStoreDumpString: String {
-        
-        switch self {
-            
-        case .success(let migrationTypes):
-            return createFormattedString(
-                ".success (", ")",
-                ("migrationTypes", migrationTypes)
-            )
-            
-        case .failure(let error):
-            return createFormattedString(
-                ".failure (", ")",
-                ("error", error)
-            )
-        }
-    }
-}
-
-
-// MARK: - MigrationType
-
-extension MigrationType: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
+extension MigrationType: CoreStoreDebugStringConvertible {
    
    // MARK: CustomDebugStringConvertible
    
@@ -658,10 +636,9 @@ extension OrderBy: CustomDebugStringConvertible, CoreStoreDebugStringConvertible
 }


-// MARK: - SaveResult
+// MARK: - PartialObject

-@available(*, deprecated, message: "Use the new DataStack.perform(asynchronous:...) and DataStack.perform(synchronous:...) family of APIs")
-extension SaveResult: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
+extension PartialObject: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
    
    // MARK: CustomDebugStringConvertible
    
@@ -675,20 +652,10 @@ extension SaveResult: CustomDebugStringConvertible, CoreStoreDebugStringConverti
    
    public var coreStoreDumpString: String {
        
-        switch self {
-            
-        case .success(let hasChanges):
-            return createFormattedString(
-                ".success (", ")",
-                ("hasChanges", hasChanges)
-            )
-            
-        case .failure(let error):
-            return createFormattedString(
-                ".failure (", ")",
-                ("error", error)
-            )
-        }
+        return createFormattedString(
+            "(", ")",
+            ("rawObject", self.rawObject as Any)
+        )
    }
 }

@@ -812,40 +779,6 @@ extension SelectTerm: CustomDebugStringConvertible, CoreStoreDebugStringConverti
 }


-// MARK: - SetupResult
-
-extension SetupResult: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
-    
-    // MARK: CustomDebugStringConvertible
-    
-    public var debugDescription: String {
-        
-        return formattedDebugDescription(self)
-    }
-    
-    
-    // MARK: CoreStoreDebugStringConvertible
-    
-    public var coreStoreDumpString: String {
-        
-        switch self {
-            
-        case .success(let storage):
-            return createFormattedString(
-                ".success (", ")",
-                ("storage", storage)
-            )
-            
-        case .failure(let error):
-            return createFormattedString(
-                ".failure (", ")",
-                ("error", error)
-            )
-        }
-    }
-}
-
-
 // MARK: - SQLiteStore

 extension SQLiteStore: CustomDebugStringConvertible, CoreStoreDebugStringConvertible {
@@ -990,7 +923,7 @@ extension VersionLock: CustomStringConvertible, CustomDebugStringConvertible, Co
            
            let data = keyValue.value
            let count = data.count
-            let bytes = data.withUnsafeBytes { (pointer: UnsafePointer<HashElement>) in
+            let bytes = data.withUnsafeBytes { (pointer) in
                
                return (0 ..< (count / MemoryLayout<HashElement>.size))
                    .map({ "\("0x\(String(pointer[$0], radix: 16, uppercase: false))")" })
@@ -1086,7 +1019,7 @@ private func createFormattedString(_ firstLine: String, _ lastLine: String, _ in
    return string
 }

-fileprivate extension String {
+extension String {
    
    fileprivate static func indention(_ level: Int = 1) -> String {
        
@@ -1107,7 +1040,7 @@ fileprivate extension String {

 // MARK: - Private: CoreStoreDebugStringConvertible

-public protocol CoreStoreDebugStringConvertible {
+public protocol CoreStoreDebugStringConvertible: CustomDebugStringConvertible {
    
    var coreStoreDumpString: String { get }
 }
@@ -1188,6 +1121,11 @@ extension NSAttributeDescription: CoreStoreDebugStringConvertible {

 extension NSAttributeType: CoreStoreDebugStringConvertible {
    
+    public var debugDescription: String {
+        
+        return formattedDebugDescription(self)
+    }
+    
    public var coreStoreDumpString: String {
        
        switch self {
@@ -1207,6 +1145,8 @@ extension NSAttributeType: CoreStoreDebugStringConvertible {
        case .objectIDAttributeType:        return ".objectIDAttributeType"
        case .UUIDAttributeType:            return ".UUIDAttributeType"
        case .URIAttributeType:             return ".URIAttributeType"
+        @unknown default:
+            fatalError()
        }
    }
 }
@@ -1221,6 +1161,11 @@ extension Bundle: CoreStoreDebugStringConvertible {

 extension NSDeleteRule: CoreStoreDebugStringConvertible {
    
+    public var debugDescription: String {
+        
+        return formattedDebugDescription(self)
+    }
+    
    public var coreStoreDumpString: String {
        
        switch self {
@@ -1229,6 +1174,8 @@ extension NSDeleteRule: CoreStoreDebugStringConvertible {
        case .nullifyDeleteRule:    return ".nullifyDeleteRule"
        case .cascadeDeleteRule:    return ".cascadeDeleteRule"
        case .denyDeleteRule:       return ".denyDeleteRule"
+        @unknown default:
+            fatalError()
        }
    }
 }
@@ -1257,7 +1204,10 @@ extension NSEntityDescription: CoreStoreDebugStringConvertible {
            
            info.append(("compoundIndexes", self.compoundIndexes))
        }
-        info.append(("uniquenessConstraints", self.uniquenessConstraints))
+        if #available(macOS 10.11, *) {
+            
+            info.append(("uniquenessConstraints", self.uniquenessConstraints))
+        }
        return createFormattedString(
            "(", ")",
            info
@@ -1388,8 +1338,39 @@ extension Optional: CoreStoreDebugStringConvertible {
    }
 }

+extension Result: CoreStoreDebugStringConvertible {
+    
+    public var debugDescription: String {
+        
+        return formattedDebugDescription(self)
+    }
+    
+    public var coreStoreDumpString: String {
+        
+        switch self {
+            
+        case .success(let info):
+            return createFormattedString(
+                ".success (", ")",
+                ("info", info)
+            )
+            
+        case .failure(let error):
+            return createFormattedString(
+                ".failure (", ")",
+                ("error", error)
+            )
+        }
+    }
+}
+
 extension Selector: CoreStoreDebugStringConvertible {
    
+    public var debugDescription: String {
+        
+        return formattedDebugDescription(self)
+    }
+    
    public var coreStoreDumpString: String {
        
        return "\"\(self)\""
--- a/Sources/CoreStore+Logging.swift
+++ b/Sources/CoreStore+Logging.swift
@@ -28,7 +28,7 @@ import Foundation

 // MARK: - CoreStore

-public extension CoreStore {
+extension CoreStore {
    
    /**
    The `CoreStoreLogger` instance to be used. The default logger is an instance of a `DefaultLogger`.
@@ -66,8 +66,8 @@ public extension CoreStore {
    internal static func assert( _ condition: @autoclosure () -> Bool, _ message: @autoclosure () -> String, fileName: StaticString = #file, lineNumber: Int = #line, functionName: StaticString = #function) {
        
        self.logger.assert(
-            condition,
-            message: message,
+            condition(),
+            message: message(),
            fileName: fileName,
            lineNumber: lineNumber,
            functionName: functionName
--- a/Sources/CoreStore+Migration.swift
+++ b/Sources/CoreStore+Migration.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CoreStore

-public extension CoreStore {
+extension CoreStore {

    /**
     Asynchronously adds a `StorageInterface` to the `defaultStack`. Migrations are also initiated by default.
--- a/Sources/CoreStore+Observing.swift
+++ b/Sources/CoreStore+Observing.swift
@@ -30,7 +30,7 @@ import CoreData
 // MARK: - CoreStore

@available(macOS 10.12, *)
-public extension CoreStore {
+extension CoreStore {
    
    /**
     Using the `defaultStack`, creates an `ObjectMonitor` for the specified `DynamicObject`. Multiple `ObjectObserver`s may then register themselves to be notified when changes are made to the `DynamicObject`.
@@ -113,7 +113,7 @@ public extension CoreStore {
     
     ```
     CoreStore.monitorList(
-         { (monitor) in
+         createAsynchronously: { (monitor) in
             self.monitor = monitor
         },
         From<MyPersonEntity>()
@@ -123,7 +123,6 @@ public extension CoreStore {
     ```
     - parameter createAsynchronously: the closure that receives the created `ListMonitor` instance
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: a `ListMonitor` for a list of `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
     */
    public static func monitorList<B: FetchChainableBuilderType>(createAsynchronously: @escaping (ListMonitor<B.ObjectType>) -> Void, _ clauseChain: B) {
        
@@ -212,7 +211,7 @@ public extension CoreStore {
     Asynchronously creates a `ListMonitor` for a sectioned list of `DynamicObject`s that satisfy the specified `SectionMonitorBuilderType` built from a chain of clauses.
     ```
     CoreStore.monitorSectionedList(
-         { (monitor) in
+         createAsynchronously: { (monitor) in
             self.monitor = monitor
         },
         From<MyPersonEntity>()
@@ -221,8 +220,8 @@ public extension CoreStore {
             .orderBy(.ascending(\.age))
     )
     ```
+     - parameter createAsynchronously: the closure that receives the created `ListMonitor` instance
     - parameter clauseChain: a `SectionMonitorBuilderType` built from a chain of clauses
-     - returns: a `ListMonitor` for a list of `DynamicObject`s that satisfy the specified `SectionMonitorBuilderType`
     */
    public static func monitorSectionedList<B: SectionMonitorBuilderType>(createAsynchronously: @escaping (ListMonitor<B.ObjectType>) -> Void, _ clauseChain: B) {
        
--- a/Sources/CoreStore+Querying.swift
+++ b/Sources/CoreStore+Querying.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CoreStore

-public extension CoreStore {
+extension CoreStore {
    
    /**
     Using the `defaultStack`, fetches the `DynamicObject` instance in the `DataStack`'s context from a reference created from a transaction or from a different managed object context.
@@ -80,11 +80,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchOne<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> D? {
+    public static func fetchOne<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> D? {
        
-        return self.defaultStack.fetchOne(from, fetchClauses)
+        return try self.defaultStack.fetchOne(from, fetchClauses)
    }
    
    /**
@@ -92,11 +93,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchOne<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> D? {
+    public static func fetchOne<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> D? {
        
-        return self.defaultStack.fetchOne(from, fetchClauses)
+        return try self.defaultStack.fetchOne(from, fetchClauses)
    }
    
    /**
@@ -109,11 +111,12 @@ public extension CoreStore {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the first `DynamicObject` instance that satisfies the specified `FetchChainableBuilderType`
+     - returns: the first `DynamicObject` instance that satisfies the specified `FetchChainableBuilderType`, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchOne<B: FetchChainableBuilderType>(_ clauseChain: B) -> B.ObjectType? {
+    public static func fetchOne<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> B.ObjectType? {
        
-        return self.defaultStack.fetchOne(clauseChain)
+        return try self.defaultStack.fetchOne(clauseChain)
    }
    
    /**
@@ -121,11 +124,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchAll<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> [D]? {
+    public static func fetchAll<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> [D] {
        
-        return self.defaultStack.fetchAll(from, fetchClauses)
+        return try self.defaultStack.fetchAll(from, fetchClauses)
    }
    
    /**
@@ -133,11 +137,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchAll<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> [D]? {
+    public static func fetchAll<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> [D] {
        
-        return self.defaultStack.fetchAll(from, fetchClauses)
+        return try self.defaultStack.fetchAll(from, fetchClauses)
    }
    
    /**
@@ -150,11 +155,12 @@ public extension CoreStore {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: all `DynamicObject` instances that satisfy the specified `FetchChainableBuilderType`
+     - returns: all `DynamicObject` instances that satisfy the specified `FetchChainableBuilderType`, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchAll<B: FetchChainableBuilderType>(_ clauseChain: B) -> [B.ObjectType]? {
+    public static func fetchAll<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> [B.ObjectType] {
        
-        return self.defaultStack.fetchAll(clauseChain)
+        return try self.defaultStack.fetchAll(clauseChain)
    }
    
    /**
@@ -162,11 +168,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchClause`s
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchCount<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> Int? {
+    public static func fetchCount<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> Int {
        
-        return self.defaultStack.fetchCount(from, fetchClauses)
+        return try self.defaultStack.fetchCount(from, fetchClauses)
    }
    
    /**
@@ -174,11 +181,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchClause`s
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchCount<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> Int? {
+    public static func fetchCount<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> Int {
        
-        return self.defaultStack.fetchCount(from, fetchClauses)
+        return try self.defaultStack.fetchCount(from, fetchClauses)
    }
    
    /**
@@ -191,11 +199,12 @@ public extension CoreStore {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the number `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - returns: the number of `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchCount<B: FetchChainableBuilderType>(_ clauseChain: B) -> Int? {
+    public static func fetchCount<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> Int {
        
-        return self.defaultStack.fetchCount(clauseChain)
+        return try self.defaultStack.fetchCount(clauseChain)
    }
    
    /**
@@ -203,11 +212,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> NSManagedObjectID? {
+    public static func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> NSManagedObjectID? {
        
-        return self.defaultStack.fetchObjectID(from, fetchClauses)
+        return try self.defaultStack.fetchObjectID(from, fetchClauses)
    }
    
    /**
@@ -215,11 +225,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchClause`s, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> NSManagedObjectID? {
+    public static func fetchObjectID<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> NSManagedObjectID? {
        
-        return self.defaultStack.fetchObjectID(from, fetchClauses)
+        return try self.defaultStack.fetchObjectID(from, fetchClauses)
    }
    
    /**
@@ -232,11 +243,12 @@ public extension CoreStore {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchChainableBuilderType`
+     - returns: the `NSManagedObjectID` for the first `DynamicObject` that satisfies the specified `FetchChainableBuilderType`, or `nil` if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchObjectID<B: FetchChainableBuilderType>(_ clauseChain: B) -> NSManagedObjectID? {
+    public static func fetchObjectID<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> NSManagedObjectID? {
        
-        return self.defaultStack.fetchObjectID(clauseChain)
+        return try self.defaultStack.fetchObjectID(clauseChain)
    }
    
    /**
@@ -244,11 +256,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: FetchClause...) -> [NSManagedObjectID]? {
+    public static func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: FetchClause...) throws -> [NSManagedObjectID] {
        
-        return self.defaultStack.fetchObjectIDs(from, fetchClauses)
+        return try self.defaultStack.fetchObjectIDs(from, fetchClauses)
    }
    
    /**
@@ -256,11 +269,12 @@ public extension CoreStore {
     
     - parameter from: a `From` clause indicating the entity type
     - parameter fetchClauses: a series of `FetchClause` instances for the fetch request. Accepts `Where`, `OrderBy`, and `Tweak` clauses.
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchClause`s, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) -> [NSManagedObjectID]? {
+    public static func fetchObjectIDs<D>(_ from: From<D>, _ fetchClauses: [FetchClause]) throws -> [NSManagedObjectID] {
        
-        return self.defaultStack.fetchObjectIDs(from, fetchClauses)
+        return try self.defaultStack.fetchObjectIDs(from, fetchClauses)
    }
    
    /**
@@ -273,11 +287,12 @@ public extension CoreStore {
     )
     ```
     - parameter clauseChain: a `FetchChainableBuilderType` built from a chain of clauses
-     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`
+     - returns: the `NSManagedObjectID` for all `DynamicObject`s that satisfy the specified `FetchChainableBuilderType`, or an empty array if no match was found
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func fetchObjectIDs<B: FetchChainableBuilderType>(_ clauseChain: B) -> [NSManagedObjectID]? {
+    public static func fetchObjectIDs<B: FetchChainableBuilderType>(_ clauseChain: B) throws -> [NSManagedObjectID] {
        
-        return self.defaultStack.fetchObjectIDs(clauseChain)
+        return try self.defaultStack.fetchObjectIDs(clauseChain)
    }
    
    /**
@@ -288,11 +303,12 @@ public extension CoreStore {
     - parameter from: a `From` clause indicating the entity type
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - returns: the result of the the query, or `nil` if no match was found. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: QueryClause...) -> U? {
+    public static func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: QueryClause...) throws -> U? {
        
-        return self.defaultStack.queryValue(from, selectClause, queryClauses)
+        return try self.defaultStack.queryValue(from, selectClause, queryClauses)
    }
    
    /**
@@ -303,11 +319,12 @@ public extension CoreStore {
     - parameter from: a `From` clause indicating the entity type
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - returns: the result of the the query, or `nil` if no match was found. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: [QueryClause]) -> U? {
+    public static func queryValue<D, U: QueryableAttributeType>(_ from: From<D>, _ selectClause: Select<D, U>, _ queryClauses: [QueryClause]) throws -> U? {
        
-        return self.defaultStack.queryValue(from, selectClause, queryClauses)
+        return try self.defaultStack.queryValue(from, selectClause, queryClauses)
    }
    
    /**
@@ -322,26 +339,12 @@ public extension CoreStore {
     )
     ```
     - parameter clauseChain: a `QueryChainableBuilderType` indicating the property/aggregate to fetch and the series of queries for the request.
-     - returns: the result of the the query as specified by the `QueryChainableBuilderType`
+     - returns: the result of the the query as specified by the `QueryChainableBuilderType`, or `nil` if no match was found.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func queryValue<B: QueryChainableBuilderType>(_ clauseChain: B) -> B.ResultType? where B.ResultType: QueryableAttributeType {
+    public static func queryValue<B: QueryChainableBuilderType>(_ clauseChain: B) throws -> B.ResultType? where B.ResultType: QueryableAttributeType {
        
-        return self.defaultStack.queryValue(clauseChain)
-    }
-    
-    /**
-     Using the `defaultStack`, queries a dictionary of attribtue values as specified by the `QueryClause`s. Requires at least a `Select` clause, and optional `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     
-     A "query" differs from a "fetch" in that it only retrieves values already stored in the persistent store. As such, values from unsaved transactions or contexts will not be incorporated in the query result.
-     
-     - parameter from: a `From` clause indicating the entity type
-     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
-     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
-     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
-     */
-    public static func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: QueryClause...) -> [[String: Any]]? {
-        
-        return self.defaultStack.queryAttributes(from, selectClause, queryClauses)
+        return try self.defaultStack.queryValue(clauseChain)
    }
    
    /**
@@ -353,10 +356,27 @@ public extension CoreStore {
     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: [QueryClause]) -> [[String: Any]]? {
+    public static func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: QueryClause...) throws -> [[String: Any]] {
        
-        return self.defaultStack.queryAttributes(from, selectClause, queryClauses)
+        return try self.defaultStack.queryAttributes(from, selectClause, queryClauses)
+    }
+    
+    /**
+     Using the `defaultStack`, queries a dictionary of attribute values as specified by the `QueryClause`s. Requires at least a `Select` clause, and optional `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
+     
+     A "query" differs from a "fetch" in that it only retrieves values already stored in the persistent store. As such, values from unsaved transactions or contexts will not be incorporated in the query result.
+     
+     - parameter from: a `From` clause indicating the entity type
+     - parameter selectClause: a `Select<U>` clause indicating the properties to fetch, and with the generic type indicating the return type.
+     - parameter queryClauses: a series of `QueryClause` instances for the query request. Accepts `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
+     - returns: the result of the the query. The type of the return value is specified by the generic type of the `Select<U>` parameter.
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
+     */
+    public static func queryAttributes<D>(_ from: From<D>, _ selectClause: Select<D, NSDictionary>, _ queryClauses: [QueryClause]) throws -> [[String: Any]] {
+        
+        return try self.defaultStack.queryAttributes(from, selectClause, queryClauses)
    }
    
    /**
@@ -381,9 +401,10 @@ public extension CoreStore {
     ```
     - parameter clauseChain: a `QueryChainableBuilderType` indicating the properties to fetch and the series of queries for the request.
     - returns: the result of the the query as specified by the `QueryChainableBuilderType`
+     - throws: `CoreStoreError.persistentStoreNotFound` if the specified entity could not be found in any store's schema.
     */
-    public static func queryAttributes<B: QueryChainableBuilderType>(_ clauseChain: B) -> [[String: Any]]? where B.ResultType == NSDictionary {
+    public static func queryAttributes<B: QueryChainableBuilderType>(_ clauseChain: B) throws -> [[String: Any]] where B.ResultType == NSDictionary {
        
-        return self.defaultStack.queryAttributes(clauseChain)
+        return try self.defaultStack.queryAttributes(clauseChain)
    }
 }
--- a/Sources/CoreStore+Setup.swift
+++ b/Sources/CoreStore+Setup.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CoreStore

-public extension CoreStore {
+extension CoreStore {
    
    /**
     Returns the `defaultStack`'s model version. The version string is the same as the name of a version-specific .xcdatamodeld file or `CoreStoreSchema`.
@@ -139,22 +139,4 @@ public extension CoreStore {
        
        return try self.defaultStack.addStorageAndWait(storage)
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new CoreStore.entityTypesByName(for:) method passing `NSManagedObject.self` as argument.")
-    public static var entityTypesByName: [EntityName: NSManagedObject.Type] {
-        
-        return self.defaultStack.entityTypesByName
-    }
-    
-    
-    // MARK: Obsolete
-    
-    @available(*, obsoleted: 3.1, renamed: "entityDescription(for:)")
-    public static func entityDescriptionForType(_ type: NSManagedObject.Type) -> NSEntityDescription? {
-        
-        return self.entityDescription(for: type)
-    }
 }
--- a/Sources/CoreStore+Transaction.swift
+++ b/Sources/CoreStore+Transaction.swift
@@ -28,10 +28,10 @@ import Foundation

 // MARK: - CoreStore

-public extension CoreStore {
+extension CoreStore {
    
    /**
-     Using the `defaultStack`, performs a transaction asynchronously where `NSManagedObject` or `CoreStoreObject` creates, updates, and deletes can be made. The changes are commited automatically after the `task` closure returns. On success, the value returned from closure will be the wrapped as `.success(userInfo: T)` in the `completion`'s `Result<T>`. Any errors thrown from inside the `task` will be reported as `.failure(error: CoreStoreError)`. To cancel/rollback changes, call `try transaction.cancel()`, which throws a `CoreStoreError.userCancelled`.
+     Using the `defaultStack`, performs a transaction asynchronously where `NSManagedObject` or `CoreStoreObject` creates, updates, and deletes can be made. The changes are commited automatically after the `task` closure returns. On success, the value returned from closure will be the wrapped as `.success(T)` in the `completion`'s `Result<T>`. Any errors thrown from inside the `task` will be reported as `.failure(CoreStoreError)`. To cancel/rollback changes, call `try transaction.cancel()`, which throws a `CoreStoreError.userCancelled`.
     
     - parameter task: the asynchronous closure where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
     - parameter completion: the closure executed after the save completes. The `Result` argument of the closure will either wrap the return value of `task`, or any uncaught errors thrown from within `task`. Cancelled `task`s will be indicated by `.failure(error: CoreStoreError.userCancelled)`. Custom errors thrown by the user will be wrapped in `CoreStoreError.userError(error: Error)`.
@@ -84,20 +84,4 @@ public extension CoreStore {
        
        self.defaultStack.refreshAndMergeAllObjects()
    }
-    
-    
-    // MARK: Deprecated
-    
-    @available(*, deprecated, message: "Use the new auto-commiting methods `perform(asynchronous:completion:)` or `perform(asynchronous:success:failure:)`. Please read the documentation on the behavior of the new methods.")
-    public static func beginAsynchronous(_ closure: @escaping (_ transaction: AsynchronousDataTransaction) -> Void) {
-        
-        self.defaultStack.beginAsynchronous(closure)
-    }
-    
-    @available(*, deprecated, message: "Use the new auto-commiting method `perform(synchronous:)`. Please read the documentation on the behavior of the new methods.")
-    @discardableResult
-    public static func beginSynchronous(_ closure: @escaping (_ transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
-        
-        return self.defaultStack.beginSynchronous(closure)
-    }
 }
--- a/Sources/CoreStoreBridge.h
+++ b/Sources/CoreStoreBridge.h
@@ -564,16 +564,4 @@ CORESTORE_EXTERN
 CSWhere *_Nonnull CSWherePredicate(NSPredicate *_Nonnull predicate) CORESTORE_RETURNS_RETAINED;


-#pragma mark CoreStoreFetchRequest
-
-// Bugfix for NSFetchRequest messing up memory management for `affectedStores`
-// http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
-NS_SWIFT_NAME(CoreStoreFetchRequest)
-@interface _CSFetchRequest: NSFetchRequest
-
-@property (nullable, nonatomic, copy, readonly) NSArray<NSPersistentStore *> *safeAffectedStores;
-
-@end
-
-
 #endif /* CoreStoreBridge_h */
--- a/Sources/CoreStoreBridge.m
+++ b/Sources/CoreStoreBridge.m
@@ -218,40 +218,3 @@ CSWhere *_Nonnull CSWherePredicate(NSPredicate *_Nonnull predicate) CORESTORE_RE
    
    return [[CSWhere alloc] initWithPredicate:predicate];
 }
-
-
-#pragma mark CoreStoreFetchRequest
-
-@interface _CSFetchRequest ()
-
-@property (nullable, nonatomic, copy) NSArray<NSPersistentStore *> *safeAffectedStores;
-@property (nullable, nonatomic, assign) CFArrayRef releaseArray;
-
-@end
-
-@implementation _CSFetchRequest
-
-// MARK: NSFetchRequest
-
- (void)setAffectedStores:(NSArray<NSPersistentStore *> *_Nullable)affectedStores {
-    
-    if (NSFoundationVersionNumber < NSFoundationVersionNumber10_0
-        || [[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){ 11, 0, 0 }]) {
-        
-        self.safeAffectedStores = affectedStores;
-        [super setAffectedStores:affectedStores];
-        return;
-    }
-    // Bugfix for NSFetchRequest messing up memory management for `affectedStores`
-    // http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
-    if (self.releaseArray != NULL) {
-        
-        CFRelease(self.releaseArray);
-        self.releaseArray = NULL;
-    }
-    self.safeAffectedStores = affectedStores;
-    [super setAffectedStores:affectedStores];
-    self.releaseArray = CFBridgingRetain([super affectedStores]);
-}
-
-@end
--- a/Sources/CoreStoreError.swift
+++ b/Sources/CoreStoreError.swift
@@ -53,6 +53,11 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
     Progressive migrations are disabled for a store, but an `NSMappingModel` could not be found for a specific source and destination model versions.
     */
    case progressiveMigrationRequired(localStoreURL: URL)
+
+    /**
+     The `LocalStorage` was configured with `.allowSynchronousLightweightMigration`, but the model can only be migrated asynchronously.
+     */
+    case asynchronousMigrationRequired(localStoreURL: URL, NSError: NSError)
    
    /**
     An internal SDK call failed with the specified `NSError`.
@@ -68,6 +73,11 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
     The transaction was cancelled by the user.
     */
    case userCancelled
+
+    /**
+     Attempted to perform a fetch but could not find any related persistent store.
+     */
+    case persistentStoreNotFound(entity: DynamicObject.Type)
    
    
    // MARK: CustomNSError
@@ -92,6 +102,9 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
            
        case .progressiveMigrationRequired:
            return CoreStoreErrorCode.progressiveMigrationRequired.rawValue
+
+        case .asynchronousMigrationRequired:
+            return CoreStoreErrorCode.asynchronousMigrationRequired.rawValue
            
        case .internalError:
            return CoreStoreErrorCode.internalError.rawValue
@@ -101,6 +114,9 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
            
        case .userCancelled:
            return CoreStoreErrorCode.userCancelled.rawValue
+
+        case .persistentStoreNotFound:
+            return CoreStoreErrorCode.persistentStoreNotFound.rawValue
        }
    }
    
@@ -127,6 +143,12 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
            return [
                "localStoreURL": localStoreURL
            ]
+
+        case .asynchronousMigrationRequired(let localStoreURL, let nsError):
+            return [
+                "localStoreURL": localStoreURL,
+                "NSError": nsError
+            ]
            
        case .internalError(let nsError):
            return [
@@ -140,6 +162,11 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
            
        case .userCancelled:
            return [:]
+
+        case .persistentStoreNotFound(let entity):
+            return [
+                "entity": entity
+            ]
        }
    }
    
@@ -161,6 +188,10 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
            
        case (.progressiveMigrationRequired(let url1), .progressiveMigrationRequired(let url2)):
            return url1 == url2
+
+        case (.asynchronousMigrationRequired(let url1, let NSError1), .asynchronousMigrationRequired(let url2, let NSError2)):
+            return url1 == url2
+                && NSError1.isEqual(NSError2)
            
        case (.internalError(let NSError1), .internalError(let NSError2)):
            return NSError1.isEqual(NSError2)
@@ -177,6 +208,9 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
            
        case (.userCancelled, .userCancelled):
            return true
+
+        case (.persistentStoreNotFound(let entity1), .persistentStoreNotFound(let entity2)):
+            return entity1 == entity2
            
        default:
            return false
@@ -205,12 +239,19 @@ public enum CoreStoreError: Error, CustomNSError, Hashable {
        case .progressiveMigrationRequired(let localStoreURL):
            hasher.combine(localStoreURL)

+        case .asynchronousMigrationRequired(let localStoreURL, let nsError):
+            hasher.combine(localStoreURL)
+            hasher.combine(nsError)
+
        case .internalError(let nsError):
            hasher.combine(nsError)

        case .userError(let error):
            hasher.combine(error as NSError)

+        case .persistentStoreNotFound(let entity):
+            hasher.combine(ObjectIdentifier(entity))
+
        case .userCancelled:
            break
        }
@@ -261,6 +302,11 @@ public enum CoreStoreErrorCode: Int {
     Progressive migrations are disabled for a store, but an `NSMappingModel` could not be found for a specific source and destination model versions.
     */
    case progressiveMigrationRequired
+
+    /**
+     The `LocalStorage` was configured with `.allowSynchronousLightweightMigration`, but the model can only be migrated asynchronously.
+     */
+    case asynchronousMigrationRequired
    
    /**
     An internal SDK call failed with the specified "NSError" userInfo key.
@@ -276,12 +322,17 @@ public enum CoreStoreErrorCode: Int {
     The transaction was cancelled by the user.
     */
    case userCancelled
+
+    /**
+     Attempted to perform a fetch but could not find any related persistent store.
+     */
+    case persistentStoreNotFound
 }


 // MARK: - NSError

-internal extension NSError {
+extension NSError {
    
    // MARK: Internal
    
--- a/Sources/CoreStoreFetchRequest+CoreStore.swift
+++ b/Sources/CoreStoreFetchRequest+CoreStore.swift
@@ -1,41 +0,0 @@
-//
-//  CoreStoreFetchRequest+CoreStore.swift
-//  CoreStore
-//
-//  Copyright © 2018 John Rommel Estropia
-//
-//  Permission is hereby granted, free of charge, to any person obtaining a copy
-//  of this software and associated documentation files (the "Software"), to deal
-//  in the Software without restriction, including without limitation the rights
-//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-//  copies of the Software, and to permit persons to whom the Software is
-//  furnished to do so, subject to the following conditions:
-//
-//  The above copyright notice and this permission notice shall be included in all
-//  copies or substantial portions of the Software.
-//
-//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-//  SOFTWARE.
-//
-
-import Foundation
-import CoreData
-
-
-// MARK: - CoreStoreFetchRequest
-
-internal extension CoreStoreFetchRequest {
-    
-    // MARK: Internal
-    
-    @nonobjc @inline(__always)
-    internal func dynamicCast<U>() -> NSFetchRequest<U> {
-        
-        return unsafeBitCast(self, to: NSFetchRequest<U>.self)
-    }
-}
--- a/Sources/CoreStoreFetchRequest.swift
+++ b/Sources/CoreStoreFetchRequest.swift
@@ -0,0 +1,91 @@
+//
+//  CoreStoreFetchRequest.swift
+//  CoreStore
+//
+//  Copyright © 2019 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+import CoreData
+import ObjectiveC
+
+
+// MARK: - CoreStoreFetchRequest
+
+// Bugfix for NSFetchRequest messing up memory management for `affectedStores`
+// http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
+internal final class CoreStoreFetchRequest<T: NSFetchRequestResult>: NSFetchRequest<NSFetchRequestResult> {
+
+    @nonobjc
+    internal func safeAffectedStores() -> [NSPersistentStore]? {
+
+        return self.copiedAffectedStores as! [NSPersistentStore]?
+    }
+
+    @nonobjc @inline(__always)
+    internal func staticCast() -> NSFetchRequest<T> {
+
+        return unsafeBitCast(self, to: NSFetchRequest<T>.self)
+    }
+
+    @nonobjc @inline(__always)
+    internal func dynamicCast<U>() -> NSFetchRequest<U> {
+
+        return unsafeBitCast(self, to: NSFetchRequest<U>.self)
+    }
+
+
+    // MARK: NSFetchRequest
+
+    @objc dynamic
+    override var affectedStores: [NSPersistentStore]? {
+
+        get {
+
+            return super.affectedStores
+        }
+        set {
+
+            if #available(iOS 11.0, macOS 10.13, watchOS 4.0, tvOS 11.0, *) {
+
+                self.copiedAffectedStores = (newValue as NSArray?)?.copy() as! NSArray?
+                super.affectedStores = newValue
+                return
+            }
+            // Bugfix for NSFetchRequest messing up memory management for `affectedStores`
+            // http://stackoverflow.com/questions/14396375/nsfetchedresultscontroller-crashes-in-ios-6-if-affectedstores-is-specified
+            if let releaseArray = self.releaseArray {
+
+                releaseArray.release()
+                self.releaseArray = nil
+            }
+            self.copiedAffectedStores = (newValue as NSArray?)?.copy() as! NSArray?
+            super.affectedStores = newValue
+            self.releaseArray = (super.affectedStores as NSArray?).map(Unmanaged<NSArray>.passRetained(_:))
+        }
+    }
+
+
+    // MARK: Private
+
+    private var copiedAffectedStores: NSArray?
+    private var releaseArray: Unmanaged<NSArray>?
+}
--- a/Sources/CoreStoreFetchedResultsController.swift
+++ b/Sources/CoreStoreFetchedResultsController.swift
@@ -33,10 +33,13 @@ import CoreData
 internal final class CoreStoreFetchedResultsController: NSFetchedResultsController<NSManagedObject> {
    
    // MARK: Internal
+
+    @nonobjc
+    internal let typedFetchRequest: CoreStoreFetchRequest<NSManagedObject>
    
    @nonobjc
-    internal convenience init<D>(dataStack: DataStack, fetchRequest: NSFetchRequest<NSManagedObject>, from: From<D>, sectionBy: SectionBy<D>? = nil, applyFetchClauses: @escaping (_ fetchRequest: NSFetchRequest<NSManagedObject>) -> Void) {
-        
+    internal convenience init<D>(dataStack: DataStack, fetchRequest: CoreStoreFetchRequest<NSManagedObject>, from: From<D>, sectionBy: SectionBy<D>? = nil, applyFetchClauses: @escaping (_ fetchRequest: CoreStoreFetchRequest<NSManagedObject>) -> Void) {
+
        self.init(
            context: dataStack.mainContext,
            fetchRequest: fetchRequest,
@@ -47,22 +50,23 @@ internal final class CoreStoreFetchedResultsController: NSFetchedResultsControll
    }
    
    @nonobjc
-    internal init<D>(context: NSManagedObjectContext, fetchRequest: NSFetchRequest<NSManagedObject>, from: From<D>, sectionBy: SectionBy<D>? = nil, applyFetchClauses: @escaping (_ fetchRequest: NSFetchRequest<NSManagedObject>) -> Void) {
+    internal init<D>(context: NSManagedObjectContext, fetchRequest: CoreStoreFetchRequest<NSManagedObject>, from: From<D>, sectionBy: SectionBy<D>? = nil, applyFetchClauses: @escaping (_ fetchRequest: CoreStoreFetchRequest<NSManagedObject>) -> Void) {
        
-        _ = from.applyToFetchRequest(
+        _ = try? from.applyToFetchRequest(
            fetchRequest,
            context: context,
            applyAffectedStores: false
        )
        applyFetchClauses(fetchRequest)
-        
+
+        self.typedFetchRequest = fetchRequest
        self.reapplyAffectedStores = { fetchRequest, context in
            
-            return from.applyAffectedStoresForFetchedRequest(fetchRequest, context: context)
+            try from.applyAffectedStoresForFetchedRequest(fetchRequest, context: context)
        }
        
        super.init(
-            fetchRequest: fetchRequest,
+            fetchRequest: fetchRequest.staticCast(),
            managedObjectContext: context,
            sectionNameKeyPath: sectionBy?.sectionKeyPath,
            cacheName: nil
@@ -71,14 +75,8 @@ internal final class CoreStoreFetchedResultsController: NSFetchedResultsControll
    
    @nonobjc
    internal func performFetchFromSpecifiedStores() throws {
-        
-        if !self.reapplyAffectedStores(self.fetchRequest, self.managedObjectContext) {
-            
-            CoreStore.log(
-                .warning,
-                message: "Attempted to perform a fetch on an \(cs_typeName(self)) but could not find any persistent store for the entity \(cs_typeName(self.fetchRequest.entityName))"
-            )
-        }
+
+        try self.reapplyAffectedStores(self.typedFetchRequest, self.managedObjectContext)
        try self.performFetch()
    }
    
@@ -97,5 +95,5 @@ internal final class CoreStoreFetchedResultsController: NSFetchedResultsControll
    // MARK: Private
    
    @nonobjc
-    private let reapplyAffectedStores: (_ fetchRequest: NSFetchRequest<NSManagedObject>, _ context: NSManagedObjectContext) -> Bool
+    private let reapplyAffectedStores: (_ fetchRequest: CoreStoreFetchRequest<NSManagedObject>, _ context: NSManagedObjectContext) throws -> Void
 }
--- a/Sources/CoreStoreObject+Convenience.swift
+++ b/Sources/CoreStoreObject+Convenience.swift
@@ -29,7 +29,7 @@ import CoreData

 // MARK: - CoreStoreObject

-public extension CoreStoreObject {
+extension CoreStoreObject {
    
    /**
     Exposes a `FetchableSource` that can fetch sibling objects of this `CoreStoreObject` instance. This may be the `DataStack`, a `BaseDataTransaction`, the `NSManagedObjectContext` itself, or `nil` if the obejct's parent is already deallocated.
--- a/Sources/CoreStoreObject+Observing.swift
+++ b/Sources/CoreStoreObject+Observing.swift
@@ -0,0 +1,591 @@
+//
+//  CoreStoreObject+Observing.swift
+//  CoreStore
+//
+//  Copyright © 2018 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+import CoreData
+
+
+// MARK: CoreStoreObjectKeyValueObservation
+
+/**
+ Observation token for `CoreStoreObject` properties. Make sure to retain this instance to keep observing notifications.
+
+ `invalidate()` will be called automatically when an `CoreStoreObjectKeyValueObservation` is deinited.
+ */
+public protocol CoreStoreObjectKeyValueObservation: class {
+
+    /**
+     `invalidate()` will be called automatically when an `CoreStoreObjectKeyValueObservation` is deinited.
+     */
+    func invalidate()
+}
+
+
+// MARK: - ValueContainer.Required
+
+extension ValueContainer.Required {
+
+    /**
+     Observes changes in the receiver value. When the returned `CoreStoreObjectKeyValueObservation` is deinited or invalidated, it will stop observing.
+
+     - parameter options: The flags indicating which values to include in the change dictionary.
+     - parameter: changeHandler: The closure called when the value is updated.
+     */
+    public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectValueDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        return self.observe(with: options, changeHandler: changeHandler)
+    }
+}
+
+
+// MARK: - ValueContainer.Optional
+
+extension ValueContainer.Optional {
+
+    /**
+     Observes changes in the receiver value. When the returned `CoreStoreObjectKeyValueObservation` is deinited or invalidated, it will stop observing.
+
+     - parameter options: The flags indicating which values to include in the change dictionary.
+     - parameter: changeHandler: The closure called when the value is updated.
+     */
+    public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectValueDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        return self.observe(with: options, changeHandler: changeHandler)
+    }
+}
+
+
+// MARK: - TransformableContainer.Required
+
+extension TransformableContainer.Required {
+
+    /**
+     Observes changes in the receiver value. When the returned `CoreStoreObjectKeyValueObservation` is deinited or invalidated, it will stop observing.
+
+     - parameter options: The flags indicating which values to include in the change dictionary.
+     - parameter: changeHandler: The closure called when the value is updated.
+     */
+    public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectTransformableDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        return self.observe(with: options, changeHandler: changeHandler)
+    }
+}
+
+
+// MARK: - TransformableContainer.Optional
+
+extension TransformableContainer.Optional {
+
+    /**
+     Observes changes in the receiver value. When the returned `CoreStoreObjectKeyValueObservation` is deinited or invalidated, it will stop observing.
+
+     - parameter options: The flags indicating which values to include in the change dictionary.
+     - parameter: changeHandler: The closure called when the value is updated.
+     */
+    public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectTransformableDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        return self.observe(with: options, changeHandler: changeHandler)
+    }
+}
+
+
+// MARK: - RelationshipContainer.ToOne
+
+extension RelationshipContainer.ToOne {
+
+    /**
+     Observes changes in the receiver value. When the returned `CoreStoreObjectKeyValueObservation` is deinited or invalidated, it will stop observing.
+
+     - parameter options: The flags indicating which values to include in the change dictionary.
+     - parameter: changeHandler: The closure called when the value is updated.
+     */
+    public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectObjectDiff<D>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        let result = _CoreStoreObjectKeyValueObservation(
+            object: self.rawObject!,
+            keyPath: self.keyPath,
+            callback: { (object, kind, newValue, oldValue, _, isPrior) in
+
+                let notification = CoreStoreObjectObjectDiff<D>(
+                    kind: kind,
+                    newNativeValue: newValue as! CoreStoreManagedObject?,
+                    oldNativeValue: oldValue as! CoreStoreManagedObject?,
+                    isPrior: isPrior
+                )
+                changeHandler(
+                    O.cs_fromRaw(object: object),
+                    notification
+                )
+            }
+        )
+        result.start(options)
+        return result
+    }
+}
+
+
+// MARK: - RelationshipContainer.ToManyUnordered
+
+extension RelationshipContainer.ToManyUnordered {
+
+    /**
+     Observes changes in the receiver value. When the returned `CoreStoreObjectKeyValueObservation` is deinited or invalidated, it will stop observing.
+
+     - parameter options: The flags indicating which values to include in the change dictionary.
+     - parameter: changeHandler: The closure called when the value is updated.
+     */
+    public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectUnorderedDiff<D>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        let result = _CoreStoreObjectKeyValueObservation(
+            object: self.rawObject!,
+            keyPath: self.keyPath,
+            callback: { (object, kind, newValue, oldValue, _, isPrior) in
+
+                let notification = CoreStoreObjectUnorderedDiff<D>(
+                    kind: kind,
+                    newNativeValue: newValue as! NSOrderedSet?,
+                    oldNativeValue: oldValue as! NSOrderedSet?,
+                    isPrior: isPrior
+                )
+                changeHandler(
+                    O.cs_fromRaw(object: object),
+                    notification
+                )
+            }
+        )
+        result.start(options)
+        return result
+    }
+}
+
+
+// MARK: - RelationshipContainer.ToManyOrdered
+
+extension RelationshipContainer.ToManyOrdered {
+
+    /**
+     Observes changes in the receiver value. When the returned `CoreStoreObjectKeyValueObservation` is deinited or invalidated, it will stop observing.
+
+     - parameter options: The flags indicating which values to include in the change dictionary.
+     - parameter: changeHandler: The closure called when the value is updated.
+     */
+    public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectOrderedDiff<D>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        let result = _CoreStoreObjectKeyValueObservation(
+            object: self.rawObject!,
+            keyPath: self.keyPath,
+            callback: { (object, kind, newValue, oldValue, indexes, isPrior) in
+
+                let notification = CoreStoreObjectOrderedDiff<D>(
+                    kind: kind,
+                    newNativeValue: newValue as! NSArray?,
+                    oldNativeValue: oldValue as! NSArray?,
+                    indexes: indexes ?? IndexSet(),
+                    isPrior: isPrior
+                )
+                changeHandler(
+                    O.cs_fromRaw(object: object),
+                    notification
+                )
+            }
+        )
+        result.start(options)
+        return result
+    }
+}
+
+
+// MARK: - CoreStoreObjectValueDiff
+
+/**
+ The object containing the changeset for an observed `ValueContainer.Required` and `ValueContainer.Optional` property.
+ */
+public final class CoreStoreObjectValueDiff<V: ImportableAttributeType> {
+
+    /**
+     Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
+     */
+    public let kind: NSKeyValueChange
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. `newValue` will be `nil` if `isPrior` is `true`.
+     */
+    public private(set) lazy var newValue: V? = self.newNativeValue.flatMap(V.cs_fromQueryableNativeType)
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`.
+     */
+    public private(set) lazy var oldValue: V? = self.oldNativeValue.flatMap(V.cs_fromQueryableNativeType)
+
+    /**
+     'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
+     */
+    public let isPrior: Bool
+
+
+    // MARK: FilePrivate
+
+    fileprivate init(kind: NSKeyValueChange, newNativeValue: V.QueryableNativeType?, oldNativeValue: V.QueryableNativeType?, isPrior: Bool) {
+
+        self.kind = kind
+        self.newNativeValue = newNativeValue
+        self.oldNativeValue = oldNativeValue
+        self.isPrior = isPrior
+    }
+
+
+    // MARK: Private
+
+    private let newNativeValue: V.QueryableNativeType?
+    private let oldNativeValue: V.QueryableNativeType?
+}
+
+
+// MARK: - CoreStoreObjectValueDiff
+
+/**
+ The object containing the changeset for an observed `TransformableContainer.Required` or `TransformableContainer.Optional` property.
+ */
+public final class CoreStoreObjectTransformableDiff<V: NSCoding & NSCopying> {
+
+    /**
+     Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
+     */
+    public let kind: NSKeyValueChange
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public let newValue: V?
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public let oldValue: V?
+
+    /**
+     'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
+     */
+    public let isPrior: Bool
+
+
+    // MARK: FilePrivate
+
+    fileprivate init(kind: NSKeyValueChange, newValue: V?, oldValue: V?, isPrior: Bool) {
+
+        self.kind = kind
+        self.newValue = newValue
+        self.oldValue = oldValue
+        self.isPrior = isPrior
+    }
+}
+
+
+// MARK: - CoreStoreObjectObjectDiff
+
+/**
+ The object containing the changeset for an observed `RelationshipContainer.ToOne` property.
+ */
+public final class CoreStoreObjectObjectDiff<D: CoreStoreObject> {
+
+    /**
+     Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
+     */
+    public let kind: NSKeyValueChange
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public private(set) lazy var newValue: D? = self.newNativeValue.flatMap(D.cs_fromRaw(object:))
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public private(set) lazy var oldValue: D? = self.oldNativeValue.flatMap(D.cs_fromRaw(object:))
+
+    /**
+     'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
+     */
+    public let isPrior: Bool
+
+
+    // MARK: FilePrivate
+
+    fileprivate init(kind: NSKeyValueChange, newNativeValue: CoreStoreManagedObject?, oldNativeValue: CoreStoreManagedObject?, isPrior: Bool) {
+
+        self.kind = kind
+        self.newNativeValue = newNativeValue
+        self.oldNativeValue = oldNativeValue
+        self.isPrior = isPrior
+    }
+
+
+    // MARK: Private
+
+    private let newNativeValue: CoreStoreManagedObject?
+    private let oldNativeValue: CoreStoreManagedObject?
+}
+
+
+// MARK: - CoreStoreObjectUnorderedDiff
+
+/**
+ The object containing the changeset for an observed `RelationshipContainer.ToManyUnordered` property.
+ */
+public final class CoreStoreObjectUnorderedDiff<D: CoreStoreObject> {
+
+    /**
+     Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
+     */
+    public let kind: NSKeyValueChange
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public private(set) lazy var newValue: Set<D> = Set(self.newNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) }))
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public private(set) lazy var oldValue: Set<D> = Set(self.oldNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) }))
+
+    /**
+     'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
+     */
+    public let isPrior: Bool
+
+
+    // MARK: FilePrivate
+
+    fileprivate init(kind: NSKeyValueChange, newNativeValue: NSOrderedSet?, oldNativeValue: NSOrderedSet?, isPrior: Bool) {
+
+        self.kind = kind
+        self.newNativeValue = newNativeValue ?? []
+        self.oldNativeValue = oldNativeValue ?? []
+        self.isPrior = isPrior
+    }
+
+
+    // MARK: Private
+
+    private let newNativeValue: NSOrderedSet
+    private let oldNativeValue: NSOrderedSet
+}
+
+
+// MARK: - CoreStoreObjectOrderedDiff
+
+/**
+ The object containing the changeset for an observed `RelationshipContainer.Ordered` property.
+ */
+public final class CoreStoreObjectOrderedDiff<D: CoreStoreObject> {
+
+    /**
+     Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
+     */
+    public let kind: NSKeyValueChange
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public private(set) lazy var newValue: [D] = self.newNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) })
+
+    /**
+     `newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     */
+    public private(set) lazy var oldValue: [D] = self.oldNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) })
+
+    /**
+     `indexes` will be `nil` unless the observed KeyPath refers to an ordered to-many property
+     */
+    public let indexes: IndexSet
+
+    /**
+     'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
+     */
+    public let isPrior: Bool
+
+
+    // MARK: FilePrivate
+
+    fileprivate init(kind: NSKeyValueChange, newNativeValue: NSArray?, oldNativeValue: NSArray?, indexes: IndexSet, isPrior: Bool) {
+
+        self.kind = kind
+        self.newNativeValue = newNativeValue ?? []
+        self.oldNativeValue = oldNativeValue ?? []
+        self.indexes = indexes
+        self.isPrior = isPrior
+    }
+
+
+    // MARK: Private
+
+    private let newNativeValue: NSArray
+    private let oldNativeValue: NSArray
+}
+
+
+// MARK: - AttributeProtocol
+
+extension AttributeProtocol {
+
+    // MARK: FilePrivate
+
+    fileprivate func observe<O: CoreStoreObject, V: ImportableAttributeType>(with options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectValueDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        let result = _CoreStoreObjectKeyValueObservation(
+            object: self.rawObject!,
+            keyPath: self.keyPath,
+            callback: { (object, kind, newValue, oldValue, _, isPrior) in
+
+                let notification = CoreStoreObjectValueDiff<V>(
+                    kind: kind,
+                    newNativeValue: newValue as! V.QueryableNativeType?,
+                    oldNativeValue: oldValue as! V.QueryableNativeType?,
+                    isPrior: isPrior
+                )
+                changeHandler(
+                    O.cs_fromRaw(object: object),
+                    notification
+                )
+            }
+        )
+        result.start(options)
+        return result
+    }
+
+    fileprivate func observe<O: CoreStoreObject, V: NSCoding & NSCopying>(with options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectTransformableDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
+
+        let result = _CoreStoreObjectKeyValueObservation(
+            object: self.rawObject!,
+            keyPath: self.keyPath,
+            callback: { (object, kind, newValue, oldValue, _, isPrior) in
+
+                let notification = CoreStoreObjectTransformableDiff<V>(
+                    kind: kind,
+                    newValue: newValue as! V?,
+                    oldValue: oldValue as! V?,
+                    isPrior: isPrior
+                )
+                changeHandler(
+                    O.cs_fromRaw(object: object),
+                    notification
+                )
+            }
+        )
+        result.start(options)
+        return result
+    }
+}
+
+
+// MARK: - _CoreStoreObjectKeyValueObservation
+
+// Mirrored implementation from https://github.com/apple/swift/blob/6e7051eb1e38e743a514555d09256d12d3fec750/stdlib/public/Darwin/Foundation/NSObject.swift#L141
+fileprivate final class _CoreStoreObjectKeyValueObservation: NSObject, CoreStoreObjectKeyValueObservation {
+
+    // MARK: FilePrivate
+
+    @nonobjc
+    fileprivate init(object: CoreStoreManagedObject, keyPath: KeyPathString, callback: @escaping (_ object: CoreStoreManagedObject, _ kind: NSKeyValueChange, _ newValue: Any?, _ oldValue: Any?, _ indexes: IndexSet?, _ isPrior: Bool) -> Void) {
+
+        let _ = _CoreStoreObjectKeyValueObservation.swizzler
+        self.keyPath = keyPath
+        self.object = object
+        self.callback = callback
+    }
+
+    @nonobjc
+    fileprivate func start(_ options: NSKeyValueObservingOptions) {
+        
+        self.object?.addObserver(self, forKeyPath: self.keyPath, options: options, context: nil)
+    }
+
+    deinit {
+
+        self.object?.removeObserver(self, forKeyPath: self.keyPath, context: nil)
+    }
+
+
+    // MARK: DynamicObjectKeyValueObservation
+
+    @nonobjc
+    public func invalidate() {
+
+        self.object?.removeObserver(self, forKeyPath: self.keyPath, context: nil)
+        self.object = nil
+    }
+
+
+    // MARK: Private
+
+    // workaround for <rdar://problem/31640524> Erroneous (?) error when using bridging in the Foundation overlay
+    @nonobjc
+    static var swizzler: Any? = cs_lazy {
+
+        let bridgeClass: AnyClass = _CoreStoreObjectKeyValueObservation.self
+        let rootObserveImpl = class_getInstanceMethod(
+            bridgeClass,
+            #selector(_CoreStoreObjectKeyValueObservation.observeValue(forKeyPath:of:change:context:))
+        )!
+        let swapObserveImpl = class_getInstanceMethod(
+            bridgeClass,
+            #selector(_CoreStoreObjectKeyValueObservation._cs_swizzle_me_observeValue(forKeyPath:of:change:context:))
+        )!
+        method_exchangeImplementations(rootObserveImpl, swapObserveImpl)
+        return nil
+    }
+
+    @nonobjc
+    private weak var object: CoreStoreManagedObject?
+
+    @nonobjc
+    private let callback: (_ object: CoreStoreManagedObject, _ kind: NSKeyValueChange, _ newValue: Any?, _ oldValue: Any?, _ indexes: IndexSet?, _ isPrior: Bool) -> Void
+
+    @nonobjc
+    private let keyPath: KeyPathString
+
+    @objc
+    private dynamic func _cs_swizzle_me_observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSString: Any]?, context: UnsafeMutableRawPointer?) {
+
+        guard
+            let object = object as? CoreStoreManagedObject,
+            object == self.object,
+            let change = change
+            else {
+
+                return
+        }
+        let rawKind: UInt = change[NSKeyValueChangeKey.kindKey.rawValue as NSString] as! UInt
+        self.callback(
+            object,
+            NSKeyValueChange(rawValue: rawKind)!,
+            change[NSKeyValueChangeKey.newKey.rawValue as NSString],
+            change[NSKeyValueChangeKey.oldKey.rawValue as NSString],
+            change[NSKeyValueChangeKey.indexesKey.rawValue as NSString] as! IndexSet?,
+            change[NSKeyValueChangeKey.notificationIsPriorKey.rawValue as NSString] as! Bool? ?? false
+        )
+    }
+}
--- a/Sources/CoreStoreObject+Querying.swift
+++ b/Sources/CoreStoreObject+Querying.swift
@@ -29,7 +29,7 @@ import Foundation

 // MARK: - ValueContainer.Required

-public extension ValueContainer.Required {
+extension ValueContainer.Required {
    
    /**
     Creates a `Where` clause by comparing if a property is equal to a value
@@ -112,7 +112,7 @@ public extension ValueContainer.Required {

 // MARK: - ValueContainer.Optional

-public extension ValueContainer.Optional {
+extension ValueContainer.Optional {
    
    /**
     Creates a `Where` clause by comparing if a property is equal to a value
@@ -223,7 +223,7 @@ public extension ValueContainer.Optional {

 // MARK: - RelationshipContainer.ToOne

-public extension RelationshipContainer.ToOne {
+extension RelationshipContainer.ToOne {
    
    /**
     Creates a `Where` clause by comparing if a property is equal to a value
@@ -258,69 +258,3 @@ public extension RelationshipContainer.ToOne {
        return Where(relationship.keyPath, isMemberOf: sequence)
    }
 }
-
-
-// MARK: Deprecated
-
-extension DynamicObject where Self: CoreStoreObject {
-    
-    @available(*, deprecated, message: "Use the String(keyPath:) initializer and pass the KeyPath: String(keyPath: \\Person.name)")
-    public static func keyPath<O, V>(_ attribute: (Self) -> ValueContainer<O>.Required<V>) -> String  {
-        
-        return attribute(self.meta).keyPath
-    }
-    
-    @available(*, deprecated, message: "Use the String(keyPath:) initializer and pass the KeyPath: String(keyPath: \\Person.name)")
-    public static func keyPath<O, V>(_ attribute: (Self) -> ValueContainer<O>.Optional<V>) -> String  {
-        
-        return attribute(self.meta).keyPath
-    }
-    
-    @available(*, deprecated, message: "Use the String(keyPath:) initializer and pass the KeyPath: String(keyPath: \\Person.friend)")
-    public static func keyPath<O, D>(_ relationship: (Self) -> RelationshipContainer<O>.ToOne<D>) -> String  {
-        
-        return relationship(self.meta).keyPath
-    }
-    
-    @available(*, deprecated, message: "Use the String(keyPath:) initializer and pass the KeyPath: String(keyPath: \\Person.friends)")
-    public static func keyPath<O, D>(_ relationship: (Self) -> RelationshipContainer<O>.ToManyOrdered<D>) -> String  {
-        
-        return relationship(self.meta).keyPath
-    }
-    
-    @available(*, deprecated, message: "Use the String(keyPath:) initializer and pass the KeyPath: String(keyPath: \\Person.friends)")
-    public static func keyPath<O, D>(_ relationship: (Self) -> RelationshipContainer<O>.ToManyUnordered<D>) -> String  {
-        
-        return relationship(self.meta).keyPath
-    }
-    
-    @available(*, deprecated, message: "Use the Where<DynamicObject>(_:) initializer that accepts the same closure argument")
-    public static func `where`(_ condition: (Self) -> Where<Self>) -> Where<Self>  {
-        
-        return condition(self.meta)
-    }
-    
-    @available(*, deprecated, message: "Use the new OrderBy<DynamicObject>(ascending:) overload that accepts the same closure argument")
-    public static func orderBy<O, V>(ascending attribute: (Self) -> ValueContainer<O>.Required<V>) -> OrderBy<Self>  {
-        
-        return OrderBy(.ascending(attribute(self.meta).keyPath))
-    }
-    
-    @available(*, deprecated, message: "Use the new OrderBy<DynamicObject>(ascending:) overload that accepts the same closure argument")
-    public static func orderBy<O, V>(ascending attribute: (Self) -> ValueContainer<O>.Optional<V>) -> OrderBy<Self>  {
-        
-        return OrderBy(.ascending(attribute(self.meta).keyPath))
-    }
-    
-    @available(*, deprecated, message: "Use the new OrderBy<DynamicObject>(descending:) overload that accepts the same closure argument")
-    public static func orderBy<O, V>(descending attribute: (Self) -> ValueContainer<O>.Required<V>) -> OrderBy<Self>  {
-        
-        return OrderBy(.descending(attribute(self.meta).keyPath))
-    }
-    
-    @available(*, deprecated, message: "Use the new OrderBy<DynamicObject>(descending:) overload that accepts the same closure argument")
-    public static func orderBy<O, V>(descending attribute: (Self) -> ValueContainer<O>.Optional<V>) -> OrderBy<Self>  {
-        
-        return OrderBy(.descending(attribute(self.meta).keyPath))
-    }
-}
--- a/Sources/CoreStoreObject.swift
+++ b/Sources/CoreStoreObject.swift
@@ -140,7 +140,7 @@ open /*abstract*/ class CoreStoreObject: DynamicObject, Hashable {

 // MARK: - DynamicObject where Self: CoreStoreObject

-public extension DynamicObject where Self: CoreStoreObject {
+extension DynamicObject where Self: CoreStoreObject {
    
    /**
     Returns the `PartialObject` instance for the object, which acts as a fast, type-safe KVC interface for `CoreStoreObject`.
--- a/Sources/CoreStoreSchema.swift
+++ b/Sources/CoreStoreSchema.swift
@@ -288,6 +288,10 @@ public final class CoreStoreSchema: DynamicSchema {
                switch child.value {
                    
                case let attribute as AttributeProtocol:
+                    CoreStore.assert(
+                        !NSManagedObject.instancesRespond(to: Selector(attribute.keyPath)),
+                        "Attribute Property name \"\(String(reflecting: entity.type)).\(attribute.keyPath)\" is not allowed because it collides with \"\(String(reflecting: NSManagedObject.self)).\(attribute.keyPath)\""
+                    )
                    let description = NSAttributeDescription()
                    description.name = attribute.keyPath
                    description.attributeType = Swift.type(of: attribute).attributeType
@@ -302,6 +306,10 @@ public final class CoreStoreSchema: DynamicSchema {
                    customGetterSetterByKeyPaths[attribute.keyPath] = (attribute.getter, attribute.setter)
                    
                case let relationship as RelationshipProtocol:
+                    CoreStore.assert(
+                        !NSManagedObject.instancesRespond(to: Selector(relationship.keyPath)),
+                        "Relationship Property name \"\(String(reflecting: entity.type)).\(relationship.keyPath)\" is not allowed because it collides with \"\(String(reflecting: NSManagedObject.self)).\(relationship.keyPath)\""
+                    )
                    let description = NSRelationshipDescription()
                    description.name = relationship.keyPath
                    description.minCount = relationship.minCount
@@ -442,15 +450,18 @@ public final class CoreStoreSchema: DynamicSchema {
            )
        }
        for (entity, entityDescription) in entityDescriptionsByEntity {
-            
-            let uniqueConstraints = entity.uniqueConstraints.filter({ !$0.isEmpty })
-            if !uniqueConstraints.isEmpty {
+
+            if #available(macOS 10.11, *) {
                
-                CoreStore.assert(
-                    entityDescription.superentity == nil,
-                    "Uniqueness constraints must be defined at the highest level possible."
-                )
-                entityDescription.uniquenessConstraints = entity.uniqueConstraints.map { $0.map { $0 as NSString } }
+                let uniqueConstraints = entity.uniqueConstraints.filter({ !$0.isEmpty })
+                if !uniqueConstraints.isEmpty {
+
+                    CoreStore.assert(
+                        entityDescription.superentity == nil,
+                        "Uniqueness constraints must be defined at the highest level possible."
+                    )
+                    entityDescription.uniquenessConstraints = entity.uniqueConstraints.map { $0.map { $0 as NSString } }
+                }
            }
            guard !entity.indexes.isEmpty else {
                
@@ -517,7 +528,14 @@ public final class CoreStoreSchema: DynamicSchema {
                return CoreStoreManagedObject.self
            }
            let managedObjectClass: AnyClass = className.withCString {
-                
+
+                // Xcode 10.1+ users: You may find this comment due to a crash while debugging on an iPhone XR device (or any A12 device).
+                // This is a known issue that should not occur in archived builds, as the AppStore strips away arm64e build architectures from the binary. So while it crashes on DEBUG, it shouldn't be an issue for live users.
+                // In the meantime, please submit a bug report to Apple and refer to similar discussions here:
+                // - https://github.com/realm/realm-cocoa/issues/6013
+                // - https://github.com/wordpress-mobile/WordPress-iOS/pull/10400
+                // - https://github.com/JohnEstropia/CoreStore/issues/291
+                // If you wish to debug with A12 devices, please use Xcode 10.0 for now.
                return objc_allocateClassPair(superClass, $0, 0)!
            }
            defer {
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
John Estropia	b2dba0d6fd	update pod version and jazzy docs	2019-03-31 00:29:43 +09:00
John Estropia	6f290213fa	update README	2019-03-31 00:05:13 +09:00
John Estropia	0ab52d2f43	converted *Result types to new Swift.Result	2019-03-30 23:58:26 +09:00
John Estropia	bf8a1062e0	deleted obsoleted and deprecated API	2019-03-30 23:56:39 +09:00
John Estropia	0e254867b6	update project for Swift 5 / Xcode 10.2	2019-03-30 23:36:56 +09:00
John Estropia	0376ac6908	bump	2019-02-28 18:57:28 +09:00
John Estropia	b3421888a6	version bump	2019-02-28 18:55:32 +09:00
John Estropia	7b3f4ae0a4	fix compile error	2019-02-28 17:58:17 +09:00
John Estropia	b4e12cc922	restore NSPersistentStore.affectedStores ARC bug workaround	2019-02-28 17:57:34 +09:00
John Estropia	6c282b18af	version bump	2019-02-28 13:14:27 +09:00
John Estropia	ebbde8b7b6	minor fix in demo app	2019-02-28 13:13:01 +09:00
John Estropia	a1407e4121	Revert workaround for iOS 10 NSFetchedResultsController (#100 )	2019-02-28 13:07:47 +09:00
John Estropia	99b871b97a	add missing documentations for Where.Expression, updated playgrounds	2019-02-20 18:47:29 +09:00
John Estropia	1cd3c4fcf4	fix compile error	2019-02-12 18:18:44 +09:00
John Estropia	e09ac9ee00	add macOS playground	2019-02-12 18:05:06 +09:00
John Estropia	4b0d134acb	remove swift 5 annotation	2019-02-12 18:03:59 +09:00
John Estropia	eeec3979ee	SwiftPM support	2019-02-12 15:48:50 +09:00
John Estropia	5b365c642d	add tests for expressio evaluations	2019-02-08 18:42:19 +09:00
John Estropia	635201868a	add comparison operators for Where.Expression	2019-02-08 17:16:56 +09:00
John Estropia	db4426e6b9	Swift 5 support. WIP: Support type-safe predicate expressions	2019-02-01 18:32:22 +09:00
John Estropia	41902fee2e	fix compiler errors	2019-01-31 16:50:43 +09:00
John Estropia	9239370793	Added reference comment explaining crashes on A12 devices #291	2019-01-29 14:15:01 +09:00
John Estropia	a4d2f326a5	Improve perfomance by bypassing bridging (similar to https://github.com/JohnEstropia/CoreStore/pull/288 )	2019-01-28 20:12:18 +09:00
John Estropia	9f54ec26e2	add Where initializer that can accept another Where clause	2019-01-28 20:10:15 +09:00
John Estropia	9425cb56d7	update documentation for -[CSListMonitor refetch:] to reflect actual behavior	2019-01-28 19:04:46 +09:00
John Estropia	1de56d2776	add missing From.orderBy(_:) overloads	2019-01-25 17:30:11 +09:00
John Estropia	b3261ea930	Update README.md	2019-01-24 16:12:12 +09:00
John Estropia	88dd7aef72	updated README	2019-01-24 15:32:54 +09:00
John Estropia	2863605d84	silence deprecation internal warnings	2019-01-23 12:25:52 +09:00
John Estropia	94d9116299	pod bump	2019-01-23 10:56:10 +09:00
John Estropia	57ddbbd515	make some test cases validate specific error codes from thrown errors	2019-01-23 10:55:58 +09:00
John Estropia	78954b9d78	version bump	2019-01-22 16:41:58 +09:00
John Estropia	4eb06c9858	Merge branch 'throwables' into develop	2019-01-22 16:38:57 +09:00
John Estropia	0d634c1dcc	add missing MARKs	2019-01-22 16:38:17 +09:00
John Estropia	84f3740ea1	fix unit test warnings	2019-01-18 17:30:54 +09:00
John Estropia	6dc48b6af7	Add docs for new throwing methods	2019-01-17 18:43:10 +09:00
John Estropia	09ce2816bf	Merge branch 'develop' into throwables	2019-01-16 17:03:49 +09:00
John Estropia	62e962eebe	Merge pull request #301 from ianbytchek/develop Resolve source entity and managed object attributes by name	2019-01-16 17:01:48 +09:00
John Estropia	682472c1bd	fetches, queries, and deletes are now throwable methods	2019-01-15 20:40:15 +09:00
Ian Bytchek	46ab70b839	Update TravisCI base image to Xcode 10 Replace deprecated build matrix configurations with newer alternatives.	2019-01-13 06:24:04 +00:00
Ian Bytchek	ac8304f977	Resolve source entity and managed object attributes by name Addresses #300 – see it for details. Also improves the use of whitespace consistency across the `CustomSchemaMappingProvider.swift` and uses method names for `cs_resolve…` over `cs_resolved…` for better alignment with [Swift API Design Guidelines](https://swift.org/documentation/api-design-guidelines).	2019-01-13 05:41:34 +00:00
John Estropia	5777831565	WIP: make fetching methods throwable	2019-01-11 19:52:12 +09:00
John Estropia	42d1f41939	Provide more context when failing to search for mapping models #299	2019-01-11 19:48:35 +09:00
John Estropia	8c30ec3a3d	minor fixes on Playgrounds and Demo app	2019-01-09 11:59:06 +09:00
John Estropia	237a1b648e	Assert on reserved property names	2019-01-09 11:58:37 +09:00
John Estropia	614f1572c2	print PartialObjects	2018-12-26 22:35:28 +08:00
John Estropia	a48f16aa8c	add Jazzy docs	2018-12-19 16:27:05 +09:00
John Estropia	cdbadae002	added comments to playground	2018-12-18 18:44:47 +09:00
John Estropia	4a28a39df6	removed long-standing workaround for NSFetchedResultsController bugs since they seem to be fixed	2018-12-18 18:43:36 +09:00
John Estropia	5febf2542d	added playgrounds just to show off	2018-12-14 19:28:55 +09:00
John Estropia	c21ab11a41	format header comment	2018-12-14 18:21:41 +09:00
John Estropia	10cd18dbf0	prototype for CoreStoreObject property observers (a.k.a. KVO)	2018-12-14 18:20:42 +09:00
John Estropia	8409a13289	Merge pull request #288 from ruslanskorb/list-monitor-number-of-objects-performance [ListMonitor] Fix performance of `numberOfObjects()`.	2018-12-06 18:53:06 +09:00
Ruslan Skorb	a9a73fa5c4	[ListMonitor] [numberOfObjects()] Return `count` of `fetchedObjects`. Casting `fetchedObjects` to `NSArray?` has better performance. https://github.com/JohnEstropia/CoreStore/pull/288	2018-12-06 10:56:30 +02:00
John Estropia	82cae2e11e	Merge pull request #292 from eliseo-juan/patch-1 Fix documentation	2018-12-06 10:54:50 +09:00
John Estropia	42caee2418	Merge pull request #287 from ruslanskorb/list-monitor-subscript-performance [ListMonitor] Fix performance of `subscript(safeSectionIndex:safeItemIndex:)`.	2018-12-06 10:54:12 +09:00
Eliseo Juan Quintanilla	1dea1d0d06	Fix documentation Changed attribtue to attribute	2018-12-05 10:09:05 +01:00
John Estropia	d344b9d878	minimum deployment version bumped to iOS 10, macOS 10.12, tvOS 10, watchOS 3. Deprecated iCloud Storage	2018-12-05 17:31:16 +09:00
John Estropia	95c1ce52cc	Merge branch 'develop' of github.com:JohnEstropia/CoreStore into develop	2018-12-05 16:17:03 +09:00
John Estropia	cc346816d6	Added new error for cases when addStorageAndWait() is used with .allowSynchronousLightweightMigration but migrations are only allowed asynchronously (related to #277 )	2018-12-05 16:15:20 +09:00
John Estropia	f14b561c33	Merge pull request #275 from DmitrijMaz/fix_queueing Fix queue validation for UnsafeDataTransaction	2018-12-05 11:02:47 +09:00
Ruslan Skorb	6f655951aa	[ListMonitor] [numberOfObjects()] Calculate the number of objects in all sections by summing the number of objects stored in `NSFetchedResultsSectionInfo`. There is a performance problem in Swift when calling `count` method on an array with a large number of fetched objects. It requires casting the array between Objective-C and Swift, that is pretty slow.	2018-11-24 16:24:14 +02:00
Ruslan Skorb	ff8fbae568	[ListMonitor] [subscript(safeSectionIndex:safeItemIndex:)] Use `subscript(indexPath:)` after the validation of `sectionIndex` and `itemIndex` to get an object. There is a performance problem in Swift when getting an object from the Objective-C array with a large number of objects using subscript. It requires casting the array between Objective-C and Swift, that is pretty slow.	2018-11-24 16:23:36 +02:00
Dmitry Mazurenko	4d4b02d076	Fix queue validation for UnsafeDataTransaction	2018-10-10 16:48:04 +03:00
John Estropia	06c0981ded	debug string for CoreStoreObject	2018-09-24 00:49:53 +09:00