As first described by Yehuda and reported to jquery-dev mailing list by Brandon Aaron http://groups.google.com/group/jquery-dev/browse_thread/thread/91adffebadfd0a53/2db48b9d486bc45e

Summary of the bug. If binding an event with one handler in two (or more) different namespaces, only the last one is bound. This happens because the namespace is not checked on other events when binding new ones. So each time a new namespaced event is bound, the old one(s) are overrun.

This patch is more of a working proof on concept, but it does pass all the event test cases. What is does is adds a default namespace ("*") to any event not containing a namespace. The event cache structure is also changed.

/cache/jq.uid/event/handle.guid(.type)

becomes

to /cache/jq.uid/event/namespace/handle.guid.

So events without a namespace ('click') end up in something like /cache/15/click/*/3().

Where an event with a namespace ('click.custom') would be /cache/15/click/custom/3()