Marshal RawMessage is not CompatibleWithStandardLibrary

[cocktail18]

Version: v1.1.7
Here is the code

import (
	"bytes"
	json2 "encoding/json"
	"testing"
)
var json = jsoniter.ConfigCompatibleWithStandardLibrary

type Test struct {
	Message json2.RawMessage
}

func TestJson(t *testing.T) {
	test := &Test{}
	test.Message = []byte("123")
	data, _ := json.Marshal(test)
	data2, _ := json2.Marshal(test)
	if bytes.Compare(data, data2) != 0 {
		t.Errorf("data: %s != data2 %s", data, data2)
	}
}

output:

=== RUN   TestJson
--- FAIL: TestJson (0.00s)
    handler_test.go:19: data: {"Message":null} != data2 {"Message":123}
FAIL

[robfig]

I think this is a dupe of #389