When using the Cython compiler directive binding=True, Cython uses a custom type to implement functions and methods. This custom type supports more Python features. The most important changes lie in inspect support.

We find several Cython bugs regarding binding=True:

• binding=True in .pxd generates global too late cython/cython#1658 (not an issue for Sage)
• Do not apply decorators twice cython/cython#1724 (see Add Cython patches to fix various issues with binding=True #23155)
• Don't use __Pyx_PyObject_CallMethO on cyfunctions cython/cython#1728 (see Add Cython patches to fix various issues with binding=True #23155)

Depends on #25842
Depends on #25845
Depends on #25848

Upstream: Reported upstream. No feedback yet.

CC: @kwankyu

Component: cython

Author: Jeroen Demeyer

Branch/Commit: u/jdemeyer/ticket/22747 @ d962040

Reviewer: Michael Orlitzky

Issue created by migration from https://trac.sagemath.org/ticket/22747