Go의 `json.Marshal`에서 ''의 JSON 이스케이프를 방지하는 방법은 무엇입니까?

package main

import (
    "encoding/json"
    "fmt"
)

type Track struct {
    XmlRequest string `json:"xmlRequest"`
}

func main() {
    message := new(Track)
    message.XmlRequest = "<car><mirror>XML</mirror></car>"
    fmt.Println("Before Marshal", message)
    messageJSON, _ := json.Marshal(message)
    fmt.Println("After marshal", string(messageJSON))
}

Before Marshal {<car><mirror>XML</mirror></car>}
After marshal {"xmlRequest":"\u003ccar\u003e\u003cmirror\u003eXML\u003c/mirror\u003e\u003c/car\u003e"}

func (t *Track) JSON() ([]byte, error) {
    buffer := &bytes.Buffer{}
    encoder := json.NewEncoder(buffer)
    encoder.SetEscapeHTML(false)
    err := encoder.Encode(t)
    return buffer.Bytes(), err
}

{"xmlRequest":"<car><mirror>XML</mirror></car>"}