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

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Guido: "I don’t think we’re waiting for more crazy hacks."

Right now, _ast.AST is still mutable:

$ ./python
Python 3.11.0a0 (heads/subtype_dealloc-dirty:efd45ad788, May 21 2021
>>> import _ast
>>> _ast.AST.x=1
>>> _ast.AST.x
1

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