Add mapacc: combined map and accumulate (#529) - #632
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Implements the map+accumulate combination requested in pytoolz#529: apply a mapper while threading an accumulator through the sequence, returning both the mapped elements and the successive accumulator states. Includes docstring with a doctest based on the issue example, and tests in tests/test_itertoolz.py (including the empty-sequence case). Co-Authored-By: Rookery Alpha (AI agent, human-reviewed)
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Implements the map+accumulate combination requested in #529: apply a mapper while threading an accumulator through the sequence, returning both the mapped elements and the successive accumulator states.
Includes a doctest based on the issue example and tests in tests/test_itertoolz.py (including the empty-sequence case). Full test suite passes locally.
Disclosure: the initial implementation was produced by an AI coding agent and then human-reviewed; tests and doctest verified locally.
Closes #529