[issue40170] [C API] Make PyTypeObject structure an opaque structure in the public C API

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


----------
pull_requests: +18741
pull_request: https://github.com/python/cpython/pull/19379

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40170>
_______________________________________