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Hmm.  Just about anything fixes the current rash of bugs.  
It's keeping the old bugs from coming back that's been the 
hangup -- don't forget to run test_weakref.py too <wink>.  
The last batch of bugs was really much subtler than this 
batch!

test_callback_in_cycle_1 is a bitch -- I think we have to stop 
its callback from ever getting invoked, not just prevent I.wr() 
from returning J ...