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patch2.txt stops abusing weakref `hash`, and seems to have 
no issues w/ Python's or Zope3's -uall/--all tests, in debug or 
release builds.  weakrefs are handled entirely in 
move_troublemakers() now; collect() doesn't even have its 
old wr_callbacks list anymore.

If there's a more elegant approach coming, great, but if it's 
not coming soon I'm going to check this in, to get as much 
developer test coverage as possible before 2.4.b1.