docs: Resync documentation with implementation - #3820
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This was referenced Jul 29, 2026
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Landed up here while writing up an
AGENTS.mdto propose for #3632Fixes documentation that has drifted from the code:
how_it_works.mdreferenced the removedreuse_series_implementation, showed a stale pandas group-by translation (.agg({"b": ["mean"]})instead ofgroupby("a")["b"].mean()), and mis-classifiednw.nth(0, 1)asMULTI_UNNAMEDwhen it isMULTI_NAMED(same error fixed in theExpansionKinddocstring).filtersemantics, thespark-like/SQLFrame note, the default constructor list in CONTRIBUTING, and adds the missingnarwhals.sql/narwhals.testingAPI-reference links.What type of PR is this? (check all applicable)