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4440f22e98
was broken because new-in-2.3 code added a tp_as_mapping slot to tuples. Repaired that. Added basic docs to check_recursion(). The code that intended to exempt tuples and strings was also broken here, and in 2.2: these should use PyXYZ_CheckExact(), not PyXYZ_Check() -- we can't know whether subclass instances are immutable. This part (and this part alone) is a bugfix candidate.