It should be noted that this part of the documentation is redundant with
function.rst's documentation of int. This one was correctly updated with Python 3.8.
return the value of the object truncated to an :class:`~numbers.Integral`
(typically an :class:`int`).
- If :meth:`__int__` is not defined then the built-in function :func:`int`
- falls back to :meth:`__trunc__`.
+ The built-in function :func:`int` falls back to :meth:`__trunc__` if neither
+ :meth:`__int__` nor :meth:`__index__` is defined.
.. _context-managers: