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

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

Please, check also the discusion happening here:

https://mail.python.org/archives/list/python-committers@python.org/thread/FHFI7QKWNHAVWVFTCHJGTYD3ZFVEUXDD/

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<https://bugs.python.org/issue43916>
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