code: func MustUnmarshalJSON(bs []byte) interface{} {
  	var x interface{}
  	if err := UnmarshalJSON(bs, &x); err != nil {
  		panic(err)
  	}
  	return x
  }
docs: // MustUnmarshalJSON parse the JSON encoded data and returns the result.
  //
  // If the data cannot be decoded, this function will panic. This function is for
  // test purposes.