code: func (l Level) String() string {
  	var t string
  	switch l {
  	case LevelDebug:
  		t = levelDebug
  	case LevelInfo:
  		t = levelInfo
  	case LevelWarn:
  		t = levelWarn
  	case LevelError:
  		t = levelError
  	case LevelFatal:
  		t = levelFatal
  	default:
  		t = strconv.FormatInt(int64(l), 10)
  	}
  	return t
  }
docs: // String returns the string representation of the level.