* Increase performance of `padded` * Update table of contents * Add exactly size of n doc to padded * Speed up `ichunked` * Optimize `chunked_even` itertool * Optimize windowed itertool * Issue 820: add powerset_of_sets * Fix a typo found by codespell * Add typing for countable.items_seen attribute. * Add join_mappings * Add doublestarmap (closes #679) * Add dft and idft * Changes for version 10.3.0 * Add unique() OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-more-itertools?expand=0&rev=53