code: func parseInt(s string) (int64, error) {
  	if s == "" {
  		return 0, nil
  	}
  
  	result, err := strconv.ParseInt(s, 10, 64)
  	if err != nil {
  		return 0, errors.Wrap(err, "parseInt")
  	}
  	return result, nil
  }
docs: // parseInt parses a string into a base 10 int