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Hi Victor,
Sorry for making this a deferred blocker. I recall that we had a brief discussion somewhere about an accidental change to the array.array type -- this is now a heap type (Py_TPFLAGS_HEAPTYPE is set), and as a consequence it is no longer immutable.
In 3.9 this is an error:
>>> import array 
>>> array.array.foo = 1
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: can't set attributes of built-in/extension type 'array.array'
>>>
But in 3.10a7 it passes:
>>> array.array.foo = 1
>>> array.array.foo 
1
>>>
I would like this type (and other types that have been or will be converted to heap types) to remain immutable. How can we do that? I think we may need a new flag bit meaning "built-in type, immutable". This bit should not be inherited of course.
What do you think? (Feel free to close if this is a duplicate -- I couldn't find where we discussed this previously, sorry.)