Use contextjson

common/badjsonmerge/merge.go

@@ -1,10 +1,10 @@
 package badjsonmerge
 
 import (
-	"encoding/json"
 	"reflect"
 
 	"github.com/sagernet/sing-box/common/badjson"
+	"github.com/sagernet/sing-box/common/json"
 	"github.com/sagernet/sing-box/option"
 	E "github.com/sagernet/sing/common/exceptions"
 )

common/json/context.go

@@ -0,0 +1,21 @@
+//go:build go1.21 && !without_contextjson
+
+package json
+
+import "github.com/sagernet/sing-box/common/contextjson"
+
+var (
+	Marshal    = json.Marshal
+	Unmarshal  = json.Unmarshal
+	NewEncoder = json.NewEncoder
+	NewDecoder = json.NewDecoder
+)
+
+type (
+	Encoder     = json.Encoder
+	Decoder     = json.Decoder
+	Token       = json.Token
+	Delim       = json.Delim
+	SyntaxError = json.SyntaxError
+	RawMessage  = json.RawMessage
+)

common/json/std.go

@@ -1,3 +1,5 @@
+//go:build !go1.21 || without_contextjson
+
 package json
 
 import "encoding/json"
@@ -15,4 +17,5 @@ type (
 	Token       = json.Token
 	Delim       = json.Delim
 	SyntaxError = json.SyntaxError
+	RawMessage  = json.RawMessage
 )