[issue40601] [C API] Hide static types from the limited C API

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

> For example, Objects/longobject.c defines "PyTypeObject PyLong_Type = {...};". This type is exposed in the limited C API (!)

Technically, it is not, see https://www.python.org/dev/peps/pep-0384/#structures
Structures like PyLong_Type are *not* part of the limited API.

> I propose to break the limited C API backward compatibility on purpose by removing these type definitions form the limited C API.

That could only be done in Python 4.0, or if we started C-API 4.0. But I don't think it's necessary here.

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nosy: +petr.viktorin

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