Use flox for grouped first, last. #10148
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1. Use flox where possible. 2. Use simple indexing where possible. Closes pydata#9647
* main: (67 commits) Refactor datetime and timedelta encoding for increased robustness (pydata#9498) Fix test_distributed::test_async (pydata#10138) Refactor concat / combine / merge into `xarray/structure` (pydata#10134) Split `apply_ufunc` out of `computation.py` (pydata#10133) Refactor modules from `core` into `xarray.computation` (pydata#10132) Refactor compatibility modules into xarray.compat package (pydata#10131) Fix type issues from pandas stubs (pydata#10128) Don't skip tests when on a `mypy` branch (pydata#10129) Change `python_files` in `pyproject.toml` to a list (pydata#10127) Better `uv` compatibility (pydata#10124) explicitly cast the dtype of `where`'s condition parameter to `bool` (pydata#10087) Use `to_numpy` in time decoding (pydata#10081) Pin pandas stubs (pydata#10119) Fix broken Zarr test (pydata#10109) Update asv badge url in README.md (pydata#10113) fix and supress some test warnings (pydata#10104) Improve handling of dtype and NaT when encoding/decoding masked and packaged datetimes and timedeltas (pydata#10050) Ensure KeyError raised for zarr datasets missing dim names (pydata#10025) Add typos check to pre-commit hooks (pydata#10040) Bump codecov/codecov-action from 5.3.1 to 5.4.0 in the actions group (pydata#10090) ...
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* main: Refactoring/fixing zarr-python v3 incompatibilities in xarray datatrees (pydata#10020) Refactor calendar fixtures (pydata#10150) Use flox for grouped first, last. (pydata#10148) Update flaky pydap test (pydata#10149)
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GroupBy.first? #9647whats-new.rstUndo the revert in #10001