code: func (lia *ListIntVar) Set(input string) error {
  	lsa := strings.Split(input, ",")
  	*lia = make([]int, len(lsa))
  	for i, s := range lsa {
  		iv, err := strconv.Atoi(s)
  		if err != nil {
  			return err
  		}
  		(*lia)[i] = iv
  	}
  	return nil
  }
docs: // Set interface implementation