[issue43908] array.array should remain immutable: add Py_TPFLAGS_IMMUTABLETYPE flag

[Erlend E. Aasland]

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

> Is anything left here?

Should the immutable flag also be applied to the heap types converted in and before Python 3.9 before closing this issue?

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<https://bugs.python.org/issue43908>
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