Gnus's message-unique-id breaks in Emacs 22

[silent.wave]

The Elisp function message-unique-id in message.el breaks in Emacs 22
if your effective uid is greater than Elisp integer can hold.  In Emacs
21, (user-uid) will overflow and wrap around.  In Emacs 22, it'd return
a float.

So, when message-unique-id pass this float number to
message-number-base36, it'd eventually complains that % operator can't
take floating number.

Where do I submit the bug fix?

Chris