VLC 0.9.0 vlc.playlist.items.count is not correct?

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I'm using VLC0.9.0 mozilla plugin. And I found that vlc.playlist.items.clear() will not change the count attribute asynchronously. BTW, I waited for 10 second to see if the only one item had been cleared, so I think it must be something wrong. May I use the deprecated version "vlc.playlist.clear()"?
Is there a working example?

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BTW: Is "playlist.stop()" perform asynchronously or not?
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OK, I found the document now:

IDLE/CLOSE : 0,
OPENING : 1,
BUFFERING : 2,
PLAYING : 3,
PAUSED : 4,
STOPPING : 5,
ERROR : 6

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And another question:

Specified "freetype-font" is OK in the first few seconds, but will be NOT availabale soon.
Is it a bug?