[docs] [issue33039] int() and math.trunc don't accept objects that only define __index__

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

@Rémi Aye, filling out derived slots is one of the things PyType_Ready does.

This would need a discussion on python-dev before going ahead and doing it though, as the closest equivalent we have to this right now is the "negative" derivation, where overriding __eq__ without overriding __hash__ implicitly marks the derived class as unhashable (look for "type->tp_hash = PyObject_HashNotImplemented;").

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<https://bugs.python.org/issue33039>
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