Narwhals v1.42.1

Changes

✨ Enhancements

• feat: when-then broadcasting (#2663)
• feat(typing): Add IntoDType alias (#2654)
• feat: add Expr.exp and Series.exp (#2667)
• enh: push down over for _horizontal expressions (#2665)

🐞 Bug fixes

• fix: fix pyarrow nightly compat (#2670)
• fix: align null ordering position for ibis (#2672)

📖 Documentation

• docs: fix replace_all typo in replace_strict docstring (#2661)

🛠️ Other improvements

• chore: refactor EagerWhen._if_then_else (#2662)

Thank you to all our contributors for making this release possible!
@MarcoGorelli, @camriddell, @dangotbanned and @raisadz