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