code: func parseBool(v string) (bool, error) {
  	switch strings.ToLower(v) {
  	case "true", "t", "yes", "y", "1", "":
  		return true, nil
  	case "false", "f", "no", "n", "0":
  		return false, nil
  	}
  	return false, fmt.Errorf(`illegal input "%s" for bool value`, v)
  }
docs: // parseBool parses a string as a boolean value.