Dialog close event does not fire when a complex hide animation is applied

In UI 1.9 a dialog with a complex hide animation does not fire its close event.

hide: "explode" works.

hide: { effect: 'drop', duration: 500, direction: 'up' } does not but did in 1.8

Example:

http://jsfiddle.net/Zy78V/

Also, the API for Dialog has an error in it. The hide option is labeled show, with the actual show option right below it.

"show

Default: null

If and how to animate the hiding of the dialog."