The `current documentation`_ of the Python-C API mentions that ``PySequence_Fast`` is part of the limited API. However, this may be a typo as all the functions interacting with a ``PySequence_Fast`` object are macros, e.g. `PySequence_Fast_GET_SIZE`, `PySequence_Fast_GET_ITEM` etc.

If this is indeed a documentation bug I'm happy to open a PR to fix this once consensus is reached.






.. _`current documentation` : https://docs.python.org/3/c-api/stable.html#contents-of-limited-api