i will grant that this behavior is sub-optimal, and also that its in
conflict with the docs - I have just updated the docs on the site to
represent this current behavior:

http://www.sqlalchemy.org/docs/unitofwork.myt#unitofwork_changed

im not exactly sure of a clean way to restore the 0.2 behavior, the
only option seems to be a "__del__" handler on the identity map
weakvaluedictionary that scans garbage-collecting objects for  changes
and adds them to a persistent collection...but in my experience anytime
you start working with __del__ the stability of the application
plummets (due to its asynchronous nature...)


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