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

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

Pablo & Serhiy, can we close this issue now?

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