.. currentmodule:: xarray

• drop support for python 3.9 (:pull:`266`) By Justus Magin.
• create a PintIndex to allow units on indexed coordinates (:pull:`163`, :issue:`162`) By Justus Magin and Benoit Bovy.
• fix :py:meth:`Dataset.pint.interp` and :py:meth:`DataArray.pint.interp` bug failing to pass through arguments (:pull:`270`, :issue:`267`) By Martijn van der Marel

• adopt SPEC0 (:pull:`228`)

  This means that the supported versions change:

  dependency	old minimum	new minimum
  python	3.8	3.9
  xarray	0.16.1	2022.06.0
  numpy	1.17	1.23
  pint	0.16	0.21

  By Justus Magin.

• add support for python 3.11 and 3.12 (:pull:`228`, :pull:`263`) By Justus Magin.

• ignore datetime units on attributes (:pull:`241`) By Justus Magin.

• drop support for python 3.7 (:pull:`153`) By Justus Magin.
• add support for python 3.10 (:pull:`155`) By Justus Magin.
• preserve :py:class:`pandas.MultiIndex` objects (:issue:`164`, :pull:`168`). By Justus Magin.
• fix "quantifying" dimension coordinates (:issue:`105`, :pull:`174`). By Justus Magin.
• allow using :py:meth:`DataArray.pint.quantify` and :py:meth:`Dataset.pint.quantify` as identity operators (:issue:`47`, :pull:`175`). By Justus Magin.

• allow special "no unit" values in :py:meth:`Dataset.pint.quantify` and :py:meth:`DataArray.pint.quantify` (:pull:`125`) By Justus Magin.
• convert the note about dimension coordinates saving their units in the attributes a warning (:issue:`124`, :pull:`126`) By Justus Magin.
• improve the documentation on the format parameter of :py:meth:`Dataset.pint.dequantify` and :py:meth:`DataArray.pint.dequantify` (:issue:`121`, :pull:`127`, :pull:`132`) By Justus Magin.
• use cf-xarray's unit registry in the plotting example (:issue:`107`, :pull:`128`). By Justus Magin.

• rewrite :py:meth:`Dataset.pint.quantify` and :py:meth:`DataArray.pint.quantify`, to use pint's UnitRegistry.parse_units instead of UnitRegistry.parse_expression (:issue:`40`) By Tom Nicholas.
• ensure the variables which causes the error is explicit if an error occurs in :py:meth:`Dataset.pint.quantify` and other methods (:pull:`43`, :issue:`91`) By Tom Nicholas and Justus Magin.
• refactor the internal conversion functions (:pull:`56`) By Justus Magin.
• allow converting indexes (except :py:class:`pandas.MultiIndex`) (:pull:`56`) By Justus Magin.
• document the reason for requiring the force_ndarray_like or force_ndarray options on unit registries (:pull:`59`) By Justus Magin.
• allow passing a format string to :py:meth:`Dataset.pint.dequantify` and :py:meth:`DataArray.pint.dequantify` (:pull:`49`) By Justus Magin.
• allow converting all data variables in a Dataset to the same units using :py:meth:`Dataset.pint.to` (:issue:`45`, :pull:`63`). By Mika Pflüger.
• update format of examples in docstrings (:pull:`64`). By Mika Pflüger.
• implement :py:meth:`Dataset.pint.sel` and :py:meth:`DataArray.pint.sel` (:pull:`60`). By Justus Magin.
• implement :py:attr:`Dataset.pint.loc` and :py:attr:`DataArray.pint.loc` (:pull:`79`). By Justus Magin.
• implement :py:meth:`Dataset.pint.drop_sel` and :py:meth:`DataArray.pint.drop_sel` (:pull:`73`). By Justus Magin.
• implement :py:meth:`Dataset.pint.chunk` and :py:meth:`DataArray.pint.chunk` (:pull:`83`). By Justus Magin.
• implement :py:meth:`Dataset.pint.reindex`, :py:meth:`Dataset.pint.reindex_like`, :py:meth:`DataArray.pint.reindex` and :py:meth:`DataArray.pint.reindex_like` (:pull:`69`). By Justus Magin.
• implement :py:meth:`Dataset.pint.interp`, :py:meth:`Dataset.pint.interp_like`, :py:meth:`DataArray.pint.interp` and :py:meth:`DataArray.pint.interp_like` (:pull:`72`, :pull:`76`, :pull:`97`). By Justus Magin.
• implement :py:meth:`Dataset.pint.ffill`, :py:meth:`Dataset.pint.bfill`, :py:meth:`DataArray.pint.ffill` and :py:meth:`DataArray.pint.bfill` (:pull:`78`). By Justus Magin.
• implement :py:meth:`Dataset.pint.interpolate_na` and :py:meth:`DataArray.pint.interpolate_na` (:pull:`82`). By Justus Magin.
• expose :py:func:`pint_xarray.setup_registry` as public API (:pull:`89`) By Justus Magin.

• add initial draft of documentation (:pull:`13`, :pull:`20`)
• implement :py:meth:`DataArray.pint.to` and :py:meth:`Dataset.pint.to` (:pull:`11`)
• rewrite :py:meth:`DataArray.pint.quantify`, :py:meth:`Dataset.pint.quantify`, :py:meth:`DataArray.pint.dequantify` and :py:meth:`Dataset.pint.dequantify` (:pull:`17`)
• expose :py:func:`pint_xarray.testing.assert_units_equal` as public API (:pull:`24`)
• fix the :py:attr:`DataArray.pint.units`, :py:attr:`DataArray.pint.magnitude` and :py:attr:`DataArray.pint.dimensionality` properties and add docstrings for all three. (:pull:`31`)
• use pint's application registry as a module-global registry (:pull:`32`)