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I don't see why you need the extra bit.  When you find
weakly referenced objects, clear the wr_object pointer of
the weakref.  Move trash weakref objects with callbacks to
the wr_callbacks list as we always did.  When the trash goes
away then PyObject_ClearWeakRefs() will invoke the callbacks
normally (we only cleared the wr_object pointer, the
backpointer list is still intact).

I'm going to see if I can make this work.  In the process I
will probably discover what I have been missing. :-)