[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:

These types now lack the Py_TPFLAGS_IMMUTABLETYPE flag:

## Types converted in Python 3.9

- _abc._abc_data
- _json.Encoder
- _json.Scanner
- _random.Random
- _struct.Struct
- _struct.unpack_iterator
- ast.AST
- posix.DirEntry
- posix.ScandirIterator
- select.devpoll
- select.epoll
- select.kevent
- select.kqueue
- select.poll
- zlib.Compress
- zlib.Decompress


## Types converted before Python 3.9

- _curses_panel.panel
- _tkinter.Tcl_Obj
- _tkinter.tkapp
- _tkinter.tktimertoken

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