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Crashers based on gc.get_referrers() should not be 
considered real bugs.  It is certainly not worth 
complexifying the code or slowing it down just to preclude 
these little perverse safe-cracking exercises.  Also, it 
is not worth the risk of introducing a real bug when the 
code was working fine.  

That being said, if the code is genuinely defective and 
has potential to cause real-world problems, then it should 
be fixed.  I would think that if there were a long-
standing problem with tuples, it would have manifested 
itself long ago.