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I had to change _PyWeakref_ClearRef() since it was also
clearing the weakref list of the trash object.  Now it just
sets wr_object to Py_None.  I also made some serious
simplifications to gcmodule by just treating trash weakref
objects with callbacks the same as objects with __del__
methods (i.e. move them to the finalizers list and then do
the transitive closure of that set).

I'm attaching a patch.  It's a work in progress.