[issue43908] array.array should remain immutable

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

> I would like this type (and other types that have been or will be converted to heap types) to remain immutable.

  Hi, Guido. I am interested in what have been broken in fact? or it's a defined behavior?

> I think we may need a new flag bit meaning "built-in type, immutable". This bit should not be inherited of course.
  
  Aggreed. Adding a new `tp_flag` is a lightweight solution.

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