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Andrew, didn't you go overboard in deleting text here?  The 
__safe_for_unpickling__ check is gone in 2.3, but most of the 
rest of the text still applies.  In particular, Cookie is still a 
problem for people inclined to worry about this, and overriding 
methods like find_global and load_global is still valuable stuff 
(the unpickler still never imports anything that doesn't come 
from an opcode triggering one of these methods).