fix: improve json marshal performance, reduce necessary allocations

pkg/json/json.go

@@ -1,7 +1,6 @@
 package json
 
 import (
-	"reflect"
 	"sync"
 
 	"github.com/bytedance/sonic"
@@ -21,9 +20,7 @@ var (
 //
 // It's like json.Marshal, but with some differences:
 //
-//   - It's ~4-5x faster in most cases.
-//
-//   - It also supports custom Marshaler interface (MarshalJSONTo(buf []byte) []byte)
+//   - It supports custom Marshaler interface (MarshalJSONTo(buf []byte) []byte)
 //     to allow further optimizations.
 //
 //   - It leverages the strutils library.
@@ -36,20 +33,20 @@ var (
 //
 //     `use_marshaler` to force using the custom marshaler for primitive types declaration (e.g. `type Status int`).
 //
-//   - It correct the behavior of *url.URL and time.Duration.
+//   - It corrects the behavior of *url.URL and time.Duration.
 //
 //   - It does not support maps other than string-keyed maps.
 func Marshal(v any) ([]byte, error) {
 	buf := newBytes()
 	defer putBytes(buf)
-	return cloneBytes(appendMarshal(reflect.ValueOf(v), buf)), nil
+	return cloneBytes(appendMarshalAny(v, buf)), nil
 }
 
 func MarshalTo(v any, buf []byte) []byte {
-	return appendMarshal(reflect.ValueOf(v), buf)
+	return appendMarshalAny(v, buf)
 }
 
-const bufSize = 1024
+const bufSize = 8192
 
 var bytesPool = sync.Pool{
 	New: func() any {