[issue43916] Check that new heap types cannot be created uninitialised

[STINNER Victor]

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


New changeset 3bb09947ec4837de75532e21dd4bd25db0a1f1b7 by Victor Stinner in branch 'master':
bpo-43916: Add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag (GH-25721)
https://github.com/python/cpython/commit/3bb09947ec4837de75532e21dd4bd25db0a1f1b7


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