Message 376568 - Python tracker

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IMO, a slot should be exposed if there is some reason for exposing it.

bpo-41073 talks about tp_dealloc, which is already exposed as Py_tp_dealloc.
Recently, Py_bf_* slots were exposed (but not as part of the limited API), in bpo-40724 which links to the reasons for exposing them.

Which other slots are we missing?