jquery/api.jquery.com — pull request #331 by antishok (2013-06-29 01:12:24+00:00)
Title: Remove optional="true" on .unbind's eventType argument

The `eventType` argument for `.unbind()` is not optional: http://jsfiddle.net/GXQAz/

(of course - it's not required for the no-arguments signature of unbind, but that is really a separate signature and in any case it is mentioned explicitly later on)