[issue43916] Mark static types newly converted to heap types as immutable: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag

[STINNER Victor]

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

Can we close this issue? Or is there a remaining task?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43916>
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