feat: add Seq.take_while - #278
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Picks up one more function from #82.
take_whileyields elements while the predicate holds and then skips the rest, matching F#Seq.takeWhile.It follows the existing
take/skipstyle, a@curry_flip(1)module function plus a fluentSeq.take_whilemethod, both lazy so they work on infinite sequences.Tests cover the functional and fluent APIs (property based against
itertools.takewhile), stopping on the first false element, and laziness onseq.infinite.Verified with
uv run pytest,ruff check,ruff format --check, andpyright.