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

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset a0a6f1167834c87f12e2eca11dd77143103e7691 by Miss Islington (bot) in branch '3.9':
Revert "bpo-40170: PyType_HasFeature() now always calls PyType_GetFlags() (GH-19378)" (GH-21390)
https://github.com/python/cpython/commit/a0a6f1167834c87f12e2eca11dd77143103e7691


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