Offlineimap 6.4.2 seems seriously broken

[John Wiegley]

I just upgraded to 6.4.2 today.  Now what I'm seeing is that every single time
I run offlineimap, it keeps uploading/download/deleting the same 65 messages
between my local All Mail and my remote All Mail.  Plus, I've marked the same
INBOX messages Read 3 times now, but they keep coming back as Unread.

Plus, I'm seeing KeyError errors almost every other sync now:

--8<---------------cut here---------------start------------->8---
ERROR: Syncing folder Lists/WG21/Reflector [acc: Gmail]
  2419
ERROR: ERROR in syncfolder for Gmail folder Lists/WG21/Reflector: Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/offlineimap/accounts.py", line 406, in syncfolder
    remotefolder.syncmessagesto(localfolder, statusfolder)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/offlineimap/folder/Base.py", line 452, in syncmessagesto
    action(dstfolder, statusfolder)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/offlineimap/folder/Base.py", line 367, in syncmessagesto_delete
    folder.deletemessages(deletelist)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/offlineimap/folder/UIDMaps.py", line 253, in deletemessages
    self._mb.deletemessages(self._uidlist(self.r2l, uidlist))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/offlineimap/folder/UIDMaps.py", line 87, in _uidlist
    return [mapping[x] for x in items]
KeyError: 2419

  2419
--8<---------------cut here---------------end--------------->8---

Should I not be using the "master" branch?

Thanks,
   John