[Python-Dev] PyAPI_FUNC() is needed to private APIs?

Hi, all.

Some functions in cpython are private. These APIs are called from only python executable or DLL. They are not called even from extension modules in stdlib.

In this time, I want to keep _PyObject_GetMethod private. https://github.com/python/cpython/pull/14015#discussion_r293351734

As far as I know, it is used to expose the function from DLL user on Windows. So I think when the private function is not intended to be called from outside of DLL, it should not use PyAPI_FUNC. Am I collect?

Currently, many private APIs uses `PyAPI_FUNC()`. Is there any downside about having much unnecessary exported functions? (e.g. slower calling invention is used, bothering link time optimization, LoadLibrary get slower, etc...)

Regards,