hai shi <shihai1...@126.com> added the comment:

> If you change this, why do it only for tp_doc, but for all the slots? NULL 
> should *always* mean that the slot is set to NULL instead of inherited. 
> (Except maybe in cases where this is dangerous; then it should result in an 
> error?

IMO, it's a proper user case.
>From bpo-26978: "I'll also try making an explicit `{Py_tp_dealloc, NULL}` 
>override the inherited value, as per Serhiy's suggestion."
Petr, do you have a PR about it?

> If you want to only change this for tp_doc, please also update the 
> PyType_Slot documentation to cover the exception.

Copy that, I will update it soon.

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<https://bugs.python.org/issue41832>
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