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OK, new patch, with the check in PyObject_Call() (and thus
slot_tp_call() recursion check removed), the addition of
PyExc_RecursionErrorInst which is an instance of
RuntimeError and a reasonable message set, and
PyErr_NormalizeException() checking the recursion depth
directly and using PyExc_RecursionErrorInst when the limit
is hit.

Hopefully this does it.  =)