code: func (m Map) UnmarshalJSON(b []byte) error {
  	var stuff map[string]interface{}
  	err := json.Unmarshal(b, &stuff)
  	if err != nil {
  		return err
  	}
  	for key, value := range stuff {
  		m[key] = value
  	}
  	return nil
  }
docs: // UnmarshalJSON will unmarshall JSON value into
  // the map representation of this value.