code: func (c *Config) Getint(key string) (int, error) {
  	if value, found := c.data[key]; found {
  		v, err := strconv.ParseInt(value, 10, 0)
  		return int(v), err
  	}
  	return 0, ErrKey
  }
docs: // Getint returns the integer value for a given key.