Implement `DISALLOW_INSTANTIATION` PyTypeFlags#5286

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Snowapril wants to merge 3 commits intoRustPython:mainfrom

Snowapril:disallow_instantiation

Commits on Dec 15, 2025

Set tp_new slot when build heap/static type

Snowapril
authored and
youknowone
committed
Improve type tp_call impl to check tp_new existence and error if not exist

Snowapril
authored and
youknowone
committed
Set DISALLOW_INSTANTIATION flag on several types according to cpython impl

Snowapril
authored and
youknowone
committed