`Py_RETURN_NOTIMPLEMENTED` should INCREF on stable API 3.11

[hpkfft]

Bug report

Bug description:

In object.h, I believe

#define Py_RETURN_NOTIMPLEMENTED return Py_NOTIMPLEMENTED

should be

#if defined(Py_LIMITED_API) && Py_LIMITED_API+0 < 0x030c0000
#  define Py_RETURN_NOTIMPLEMENTED return Py_NewRef(Py_NOTIMPLEMENTED)
#else
#  define Py_RETURN_NOTIMPLEMENTED return Py_NOTIMPLEMENTED

and Py_NotImplemented should add Changed in version 3.12: Py_NOTIMPLEMENTED is immortal.

and Py_RETURN_NOTIMPLEMENTED should say Return Py_NotImplemented from a function. without saying it creates a new strong reference.

CPython versions tested on:

3.14

Operating systems tested on:

Linux

Linked PRs

• gh-140487: Fix Py_RETURN_NOTIMPLEMENTED in limited C API 3.11 #140636
• [3.14] gh-140487: Fix Py_RETURN_NOTIMPLEMENTED in limited C API 3.11 (GH-140636) #140668
• [3.13] gh-140487: Fix Py_RETURN_NOTIMPLEMENTED in limited C API 3.11 (GH-140636) #140670

[sergey-miryanov]

@hpkfft Do you want to add a PR for this?

[corona10]

cc @vstinner

[vstinner]

I created #140636 to fix the macro.

Py_RETURN_NONE, Py_RETURN_TRUE and Py_RETURN_FALSE have already been fixed by commit 9258f3d (issue #134989).