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Accept the documented k keyword in lag transforms - #275
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lag(x, k=2)raises TypeError for every supported input type because the public function calls its parameterkwhile the singledispatch implementations call itoffset. Acceptkconsistently for pandas, NumPy and Narwhals; preserve the previously acceptedoffsetkeyword as an alias. Tests cover lag, lead, zero offsets, both keyword spellings, and use in a formula.Validation: the added regression tests fail on main (
81e675b) and pass with this patch. Related tests:python -m pytest tests/transforms/test_lag.py -q. Changed files passruff checkandruff format.