Terry J. Reedy <tjre...@udel.edu> added the comment:

Semi-seriously, _PyEval_ForArminRigoOnly_
/* This function does whatever Armin Rigo wants it to do.
He may change it at any time. Do not use it. */

This would let you experiment with the boundary as you will (with review, of 
course) and relieve us of any obligation to anyone else who uses it.

CPython got the Don Beaudry metaclass hook sometime before 1.5. (I have no idea 
of its internal name or implementation.) It was also used, at his own risk, by 
Jim Fulton. Much later, in 2.2, it because the basis for new-style classes, 
which are now simply Python 3 classes.
http://www.python.org/doc/essays/metaclasses/

----------
nosy: +terry.reedy

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