removed long-standing workaround for NSFetchedResultsController bugs since they seem to be fixed

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"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
-        <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"/>
         <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">
+                            <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="558"/>
+                                <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"/>

CoreStoreDemo/CoreStoreDemo/List and Object Observers 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
@@ -305,6 +310,21 @@ class ListObserverDemoViewController: UITableViewController, ListSectionObserver
             completion: { _ in }
         )
     }
+
+    @IBAction private dynamic func shuffleBarButtonItemTouched(_ sender: AnyObject?) {
+
+        ColorsDemo.stack.perform(
+            asynchronous: { (transaction) in
+
+                for palette in (transaction.fetchAll(From<Palette>()) ?? []) {
+
+                    palette.hue .= Palette.randomHue()
+                    palette.colorName .= nil
+                }
+            },
+            completion: { _ in }
+        )
+    }
     
     private func setTable(enabled: Bool) {
         

CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/Palette.swift

@@ -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
     }

Sources/CoreStoreObject+Observing.swift

@@ -47,6 +47,12 @@ public protocol CoreStoreObjectKeyValueObservation: class {
 
 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)
@@ -58,6 +64,12 @@ extension ValueContainer.Required {
 
 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)
@@ -69,6 +81,12 @@ extension ValueContainer.Optional {
 
 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)
@@ -80,6 +98,12 @@ extension TransformableContainer.Required {
 
 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)
@@ -91,6 +115,12 @@ extension TransformableContainer.Optional {
 
 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(
@@ -120,6 +150,12 @@ extension RelationshipContainer.ToOne {
 
 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(
@@ -149,6 +185,12 @@ extension RelationshipContainer.ToManyUnordered {
 
 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(
@@ -177,6 +219,9 @@ extension RelationshipContainer.ToManyOrdered {
 
 // MARK: - CoreStoreObjectValueDiff
 
+/**
+ The object containing the changeset for an observed `ValueContainer.Required` and `ValueContainer.Optional` property.
+ */
 public final class CoreStoreObjectValueDiff<V: ImportableAttributeType> {
 
     /**
@@ -185,12 +230,12 @@ public final class CoreStoreObjectValueDiff<V: ImportableAttributeType> {
     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.
+     `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()`. In general, get the most up to date value by accessing it directly on the observed object instead.
+     `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)
 
@@ -220,6 +265,9 @@ public final class CoreStoreObjectValueDiff<V: ImportableAttributeType> {
 
 // MARK: - CoreStoreObjectValueDiff
 
+/**
+ The object containing the changeset for an observed `TransformableContainer.Required` or `TransformableContainer.Optional` property.
+ */
 public final class CoreStoreObjectTransformableDiff<V: NSCoding & NSCopying> {
 
     /**
@@ -257,6 +305,9 @@ public final class CoreStoreObjectTransformableDiff<V: NSCoding & NSCopying> {
 
 // MARK: - CoreStoreObjectObjectDiff
 
+/**
+ The object containing the changeset for an observed `RelationshipContainer.ToOne` property.
+ */
 public final class CoreStoreObjectObjectDiff<D: CoreStoreObject> {
 
     /**
@@ -300,6 +351,9 @@ public final class CoreStoreObjectObjectDiff<D: CoreStoreObject> {
 
 // MARK: - CoreStoreObjectUnorderedDiff
 
+/**
+ The object containing the changeset for an observed `RelationshipContainer.ToManyUnordered` property.
+ */
 public final class CoreStoreObjectUnorderedDiff<D: CoreStoreObject> {
 
     /**
@@ -343,6 +397,9 @@ public final class CoreStoreObjectUnorderedDiff<D: CoreStoreObject> {
 
 // MARK: - CoreStoreObjectOrderedDiff
 
+/**
+ The object containing the changeset for an observed `RelationshipContainer.Ordered` property.
+ */
 public final class CoreStoreObjectOrderedDiff<D: CoreStoreObject> {
 
     /**
@@ -451,6 +508,7 @@ fileprivate final class _CoreStoreObjectKeyValueObservation: NSObject, CoreStore
 
     // 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
@@ -459,6 +517,7 @@ fileprivate final class _CoreStoreObjectKeyValueObservation: NSObject, CoreStore
         self.callback = callback
     }
 
+    @nonobjc
     fileprivate func start(_ options: NSKeyValueObservingOptions) {
         
         self.object?.addObserver(self, forKeyPath: self.keyPath, options: options, context: nil)
@@ -472,6 +531,7 @@ fileprivate final class _CoreStoreObjectKeyValueObservation: NSObject, CoreStore
 
     // MARK: DynamicObjectKeyValueObservation
 
+    @nonobjc
     public func invalidate() {
 
         self.object?.removeObserver(self, forKeyPath: self.keyPath, context: nil)
@@ -482,7 +542,8 @@ fileprivate final class _CoreStoreObjectKeyValueObservation: NSObject, CoreStore
     // MARK: Private
 
     // workaround for <rdar://problem/31640524> Erroneous (?) error when using bridging in the Foundation overlay
-    @nonobjc static var swizzler: Any? = cs_lazy {
+    @nonobjc
+    static var swizzler: Any? = cs_lazy {
 
         let bridgeClass: AnyClass = _CoreStoreObjectKeyValueObservation.self
         let rootObserveImpl = class_getInstanceMethod(
@@ -497,11 +558,17 @@ fileprivate final class _CoreStoreObjectKeyValueObservation: NSObject, CoreStore
         return nil
     }
 
-    @nonobjc private weak var object: CoreStoreManagedObject?
+    @nonobjc
-    @nonobjc private let callback: (_ object: CoreStoreManagedObject, _ kind: NSKeyValueChange, _ newValue: Any?, _ oldValue: Any?, _ indexes: IndexSet?, _ isPrior: Bool) -> Void
+    private weak var object: CoreStoreManagedObject?
-    @nonobjc private let keyPath: KeyPathString
 
-    @objc private dynamic func _cs_swizzle_me_observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSString: Any]?, context: UnsafeMutableRawPointer?) {
+    @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,

Sources/FetchedResultsControllerDelegate.swift

@@ -86,10 +86,6 @@ internal final class FetchedResultsControllerDelegate: NSObject, NSFetchedResult
             
             return
         }
-        
-        self.deletedSections = []
-        self.insertedSections = []
-        
         self.handler?.controllerWillChangeContent(controller)
     }
     
@@ -104,7 +100,6 @@ internal final class FetchedResultsControllerDelegate: NSObject, NSFetchedResult
             
             return
         }
-        
         self.handler?.controllerDidChangeContent(controller)
     }
     
@@ -115,98 +110,11 @@ internal final class FetchedResultsControllerDelegate: NSObject, NSFetchedResult
             
             return
         }
-        
-        guard var actualType = NSFetchedResultsChangeType(rawValue: type.rawValue) else {
-            
-            // This fix is for a bug where iOS passes 0 for NSFetchedResultsChangeType, but this is not a valid enum case.
-            // Swift will then always execute the first case of the switch causing strange behaviour.
-            // https://forums.developer.apple.com/thread/12184#31850
-            return
-        }
-        
-        // This whole dance is a workaround for a nasty bug introduced in XCode 7 targeted at iOS 8 devices
-        // http://stackoverflow.com/questions/31383760/ios-9-attempt-to-delete-and-reload-the-same-index-path/31384014#31384014
-        // https://forums.developer.apple.com/message/9998#9998
-        // https://forums.developer.apple.com/message/31849#31849
-
-        if #available(iOS 10.0, tvOS 10.0, watchOS 3.0, *) {
-         
-            // I don't know if iOS 10 even attempted to fix this mess...
-            if case .update = actualType,
-                indexPath != nil,
-                newIndexPath != nil {
-                
-                actualType = .move
-            }
-        }
-        
-        switch actualType {
-            
-        case .update:
-            guard let section = indexPath?[0] else {
-                
-                return
-            }
-            if self.deletedSections.contains(section)
-                || self.insertedSections.contains(section) {
-                
-                return
-            }
-            
-        case .move:
-            guard let indexPath = indexPath, let newIndexPath = newIndexPath else {
-                
-                return
-            }
-            guard indexPath == newIndexPath else {
-                
-                break
-            }
-            if self.insertedSections.contains(indexPath[0]) {
-                
-                // Observers that handle the .Move change are advised to delete then reinsert the object instead of just moving. This is especially true when indexPath and newIndexPath are equal. For example, calling tableView.moveRowAtIndexPath(_:toIndexPath) when both indexPaths are the same will crash the tableView.
-                self.handler?.controller(
-                    controller,
-                    didChangeObject: anObject,
-                    atIndexPath: indexPath,
-                    forChangeType: .move,
-                    newIndexPath: newIndexPath
-                )
-                return
-            }
-            if self.deletedSections.contains(indexPath[0]) {
-                
-                self.handler?.controller(
-                    controller,
-                    didChangeObject: anObject,
-                    atIndexPath: nil,
-                    forChangeType: .insert,
-                    newIndexPath: indexPath
-                )
-                return
-            }
-            guard #available(iOS 9.0, tvOS 9.0, watchOS 3.0, *) else {
-                
-                return
-            }
-            self.handler?.controller(
-                controller,
-                didChangeObject: anObject,
-                atIndexPath: indexPath,
-                forChangeType: .update,
-                newIndexPath: nil
-            )
-            return
-            
-        default:
-            break
-        }
-        
         self.handler?.controller(
             controller,
             didChangeObject: anObject,
             atIndexPath: indexPath,
-            forChangeType: actualType,
+            forChangeType: type,
             newIndexPath: newIndexPath
         )
     }
@@ -218,14 +126,6 @@ internal final class FetchedResultsControllerDelegate: NSObject, NSFetchedResult
             
             return
         }
-        
-        switch type {
-            
-        case .delete:   self.deletedSections.insert(sectionIndex)
-        case .insert:   self.insertedSections.insert(sectionIndex)
-        default: break
-        }
-        
         self.handler?.controller(
             controller,
             didChangeSection: sectionInfo,
@@ -242,13 +142,4 @@ internal final class FetchedResultsControllerDelegate: NSObject, NSFetchedResult
             sectionIndexTitleForSectionName: sectionName
         )
     }
-    
-    
-    // MARK: Private
-    
-    @nonobjc
-    private var deletedSections = Set<Int>()
-    
-    @nonobjc
-    private var insertedSections = Set<Int>()
 }