json.RawMessage backwards compatibility #524
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In encoding/json, there is MarshalJSON() and UnmarshaslJSON() for RawMessage. Missing this two method leads to different behavior while Marshal() jsoniter.RawMessage using std json package.
Example code below
```
package main
import (
"fmt"
"encoding/json"
"github.com/json-iterator/go"
)
type T struct {
Msg jsoniter.RawMessage
}
func main() {
var j T
raw := []byte(`{ "Msg": {"Foo": "Bar"}}`)
jsoniter.Unmarshal(raw, &j)
b1, _ := json.Marshal(j.Msg)
fmt.Printf("%s\n", b1) /// Expect `{"Foo": "Bar"}` but got `"IHsiRm9vIjogIkJhciJ9"`
b2, _ := jsoniter.Marshal(j.Msg)
fmt.Printf("%s\n", b2)
}
```
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We ran into this issue at work. I started digging into it, and found that someone had already fixed it in #474, but hadn't added any tests. Hopefully this gets it over the finish line!