Add format config support

option/json.go

@@ -2,33 +2,33 @@ package option
 
 import (
 	"encoding/json"
+
+	"github.com/sagernet/sing/common/x/linkedhashmap"
 )
 
-func ToMap(v any) (map[string]any, error) {
+func ToMap(v any) (*linkedhashmap.Map[string, any], error) {
 	bytes, err := json.Marshal(v)
 	if err != nil {
 		return nil, err
 	}
-	var content map[string]any
+	var content linkedhashmap.Map[string, any]
 	err = json.Unmarshal(bytes, &content)
 	if err != nil {
 		return nil, err
 	}
-	return content, nil
+	return &content, nil
 }
 
-func MergeObjects(objects ...any) (map[string]any, error) {
-	content := make(map[string]any)
+func MergeObjects(objects ...any) (*linkedhashmap.Map[string, any], error) {
+	var content linkedhashmap.Map[string, any]
 	for _, object := range objects {
 		objectMap, err := ToMap(object)
 		if err != nil {
 			return nil, err
 		}
-		for k, v := range objectMap {
-			content[k] = v
-		}
+		content.PutAll(objectMap)
 	}
-	return content, nil
+	return &content, nil
 }
 
 func MarshallObjects(objects ...any) ([]byte, error) {