- 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

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