I checked " Types converted pre Python 3.9" and "Types converted in Python 3.9" of:
https://discuss.python.org/t/list-of-built-in-types-converted-to-heap-types/8403

(I didn't check "Types converted in Python 3.10" yet.)

These lists are not complete, for example select.kevent was not listed whereas it has a bug.


_struct.unpack_iterator can be modified to use Py_TPFLAGS_DISALLOW_INSTANTIATION: its tp_new method always raises an exception.


Bugs!

* select.kevent: BUG, use {Py_tp_new, PyType_GenericNew} slot which doesn't properly initialize kqueue_event_Object!

Need review:

* _ast.AST: use {Py_tp_new, PyType_GenericNew} and {Py_tp_init, ast_type_init} slots. What happens if tp_new is called without calling tp_init?

Implement tp_new (ok!):

* _abc._abc_data
* _json.Scanner
* _json.Encoder
* select.devpoll
* select.epoll
* select.kqueue
* _random.Random
* _struct.Struct 

Other cases (ok!):

* _ssl.SSLError inherits from OSError and reuses OSError structure (PyOSErrorObject): the inherited tp_new works as expected.
* select.poll: Py_TPFLAGS_DISALLOW_INSTANTIATION