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

[STINNER Victor]

STINNER Victor <vstin...@python.org> added the comment:


New changeset 9746cda705decebc0ba572d95612796afd06dcd4 by Erlend Egeberg 
Aasland in branch 'master':
bpo-43916: Apply Py_TPFLAGS_DISALLOW_INSTANTIATION to selected types (GH-25748)
https://github.com/python/cpython/commit/9746cda705decebc0ba572d95612796afd06dcd4


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