It is incomplete. For example arrayiterator did have tp_new = NULL (in other words, PyArrayIter_Type.tp_new was not set to non-NULL value).

In 3.9:

>>> import array
>>> type(iter(array.array('I')))()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot create 'arrayiterator' instances

In 3.10:

>>> import array
>>> type(iter(array.array('I')))()
<array.arrayiterator object at 0x7f02f88db5c0>