Narwhals v1.18.4

Changes

✨ Enhancements

• feat: add Series and Expr arg_min & arg_max (#1529)

🐞 Bug fixes

• fix: allow np.scalar to be used in Series.getitem (#1515)
• fix: fix pyarrow len aggregation behaviour for depth-1 exprs (#1589)

📖 Documentation

• docs: document arguments and returns in DataFrame class (#1594)
• docs: add tea-tasting to ecosystem (#1593)
• docs: Correct small error in IntoDataFrameT and IntoSeriesT (#1591)
• docs: add docstring example for Array in narwhals.dtypes (#1576)

🛠️ Other improvements

• test: xfail cudf argmin / argmax (#1599)
• chore: use set_axis in maybe_set_index (#1598)
• test: fixup more cuDF xfails (#1596)
• test: xfail test_group_by_shift_raises for cudf (#1595)
• chore: Add some Compliant Protocols (#1522)

Thank you to all our contributors for making this release possible!
@AlessandroMiola, @DeaMariaLeon, @Dhanunjaya-Elluri, @MarcoGorelli, @Nathan-Bransby-NMT, @e10v, @marenwestermann and @thevro