code: func (c *Client) StatsMap(key string) (map[string]string, error) {
  	rv := make(map[string]string)
  	st, err := c.Stats(key)
  	if err != nil {
  		return rv, err
  	}
  	for _, sv := range st {
  		rv[sv.Key] = sv.Val
  	}
  	return rv, nil
  }
docs: // StatsMap requests server-side stats similarly to Stats, but returns
  // them as a map.
  //
  // Use "" as the stat key for toplevel stats.