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

[Erlend Egeberg Aasland]

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

Victor:
> And in the "Porting to Python 3.10", I don't know if we should suggest reviewing metatypes implemented in C which overrides tp_setattro, to take the new flag in account.

I don't know either; perhaps someone else could chime in here. I've added a draft of a minimal What's New (PR comin' up in a few seconds).

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