title: Change handler not called on radio input on Firefox
body: <p>I've distilled the issue down to this jsfiddle: <a href="http://jsfiddle.net/shaggyfrog/DUqYW/3/" rel="nofollow">http://jsfiddle.net/shaggyfrog/DUqYW/3/</a></p>
  
  <p>On Chrome/Mac and Safari/Mac, you should get the "foo" alert every time you (re)load the page.</p>
  
  <p>On Firefox/Mac, the "foo" alert only comes up the first time. Subsequent reloads do not trigger it.</p>
  
  <p>This is either: (A) a bug in jQuery on Firefox, where a change handler on a radio input should get called irrespective of its state when it's checked; (B) a different jQuery bug, where the change handler should not be called if it's already checked; or (C) me doing something stupid.</p>
  
  <p>Is this a legitimate bug or am I a legitimate n00b?</p>