- update to 8.4.0:
* New itertools
* :func:`mark_ends` (thanks to kalekundert)
* :func:`is_sorted`
* Changes to existing itertools:
* :func:`islice_extended` can now be used with real slices (thanks to cool-RR)
* The implementations for :func:`filter_except` and :func:`map_except` were improved (thanks to SergBobrovsky)
* Other changes
* Automated tests now enforce code style (using `black `__)
* The various signatures of :func:`islice_extended` and :func:`numeric_range` now appear in the docs (thanks to dsfulf)
* The test configuration for mypy was updated (thanks to blueyed)