- update to 8.7.0:
* New functions
* :func:`convolve`
* :func:`product_index`, :func:`combination_index`, and :func:`permutation_index`
* :func:`value_chain`
* Changes to existing functions
* :func:`distinct_combinations` now uses a non-recursive algorithm
* :func:`pad_none` is now the preferred name for :func:`padnone`, though the latter remains available.
* :func:`pairwise` will now use the Python standard library implementation on Python 3.10+
* :func:`sort_together` now accepts a ``key`` argument
* :func:`seekable` now has a ``peek`` method, and can indicate whether the iterator it's wrapping is exhausted
* :func:`time_limited` can now indicate whether its iterator has expired
* The implementation of :func:`unique_everseen` was improved
* Other changes:
* Various documentation updates