check_set_special_type_attr() is used to prevent setting the following attributes:

* __name__
* __qualname__
* __module__
* __bases__
* __doc__

Right now, I cannot set the attribues on array.array type:

$ ./python
Python 3.10.0a7+ (heads/debug_doc2-dirty:0623fdb60d, Apr 29 2021, 12:06:18)
>>> import array

>>> array.array.__name__ = 'newname'
TypeError: can't set attributes of built-in/extension type 'array.array'

>>> array.array.__qualname__ = 'newname'
TypeError: can't set attributes of built-in/extension type 'array.array'

>>> array.array.__module__ = 'new module'
TypeError: can't set attributes of built-in/extension type 'array.array'

>>> array.array.__bases__ = (int,)
TypeError: can't set attributes of built-in/extension type 'array.array'

>>> array.array.__doc__ = 'doc'
TypeError: can't set attributes of built-in/extension type 'array.array'

I guess that type_setattro() is used and it checks for Py_TPFLAGS_IMMUTABLETYPE flag early.