[issue40989] [C API] Remove _Py_NewReference() and _Py_ForgetReference() from the public C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Work on this issue started in Python 3.9 with the following change of bpo-39542:

commit f58bd7c1693fe041f7296a5778d0a11287895648
Author: Victor Stinner <vstinner at python.org>
Date:   Wed Feb 5 13:12:19 2020 +0100

    bpo-39542: Make PyObject_INIT() opaque in limited C API (GH-18363)
    
    In the limited C API, PyObject_INIT() and PyObject_INIT_VAR() are now
    defined as aliases to PyObject_Init() and PyObject_InitVar() to make
    their implementation opaque. It avoids to leak implementation details
    in the limited C API.
    
    Exclude the following functions from the limited C API, move them
    from object.h to cpython/object.h:
    
    * _Py_NewReference()
    * _Py_ForgetReference()
    * _PyTraceMalloc_NewReference()
    * _Py_GetRefTotal()

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