I'd be happy to see `float.__setformat__` go, if it's not still needed for Python's test suite (which was its entire raison d'être). If no-one noticed the accidental misnaming, then it's pretty clear no-one's been using it.

I'd like to bet that there are at least a few people out there using float.__getformat__, despite that its docstring says "You probably don't want to use this function".

Maybe we could consider moving the information contained in __getformat__ to somewhere more accessible (e.g., a new field in sys.float_info)?