`c.AddID` documentation appears to be incorrect

[iconoclasthero]

the gompd code uses the protocol addid:

// Add adds the file/directory uri to playlist. Directories add recursively.
func (c *Client) Add(uri string) error {
	return c.Command("add %s", uri).OK()
}

// AddID adds the file/directory uri to playlist and returns the identity
// id of the song added. If pos is positive, the song is added to position
// pos.
func (c *Client) AddID(uri string, pos int) (int, error) {
	var cmd *Command
	if pos >= 0 {
		cmd = c.Command("addid %s %d", uri, pos)
	} else {
		cmd = c.Command("addid %s", uri)
	}
	attrs, err := cmd.Attrs()
	if err != nil {
		return -1, err
	}
	tok, ok := attrs["Id"]
	if !ok {
		return -1, textproto.ProtocolError("addid did not return Id")
	}
	return strconv.Atoi(tok)
}

and the documentation specifically states that it "adds the file/directory uri to playlist and returns the identity id of the song added." However, this seems unpossible, first and foremost because it wouldn't be able to return a single int for the songid if a directory with >1 song were to be added. Secondly, from the mpd protocol documentation:

addid {URI} [POSITION]
Adds a song to the playlist (non-recursive) and returns the song id. URI is always a single file or URL. For example:

addid "foo.mp3"
Id: 999
OK

If the second parameter is given, then the song is inserted at the specified position. If the parameter starts with + or -, then it is relative to the current song 8; e.g. +0 inserts right after the current song and -0 inserts right before the current song (i.e. zero songs between the current song and the newly added song).

It specifically states "song" and "non-recursive" and "URI is always a single file or [a single] URL." There's nothing in the gompd code that suggests that it recuses the URI string and even if it did, the int returned would be ambiguous at best.