What's new in 1.0.4 (May ??, 2020)

These are the changes in pandas 1.0.4. See :ref:`release` for a full changelog including other versions of pandas.

Fixed regressions

Bug where :meth:`Series.isna` and :meth:`DataFrame.isna` would raise for categorical dtype when pandas.options.mode.use_inf_as_na was set to True (:issue:`33594`)
Bug in :meth:`GroupBy.first` and :meth:`GroupBy.last` where None is not preserved in object dtype (:issue:`32800`)
Bug in DataFrame reductions using numeric_only=True and ExtensionArrays (:issue:`33256`).
Fix performance regression in memory_usage(deep=True) for object dtype (:issue:`33012`)
Bug where :meth:`Categorical.replace` would replace with NaN whenever the new value and replacement value were equal (:issue:`33288`)
Bug where an ordered :class:`Categorical` containing only NaN values would raise rather than returning NaN when taking the minimum or maximum (:issue:`33450`)

.. contributors:: v1.0.3..v1.0.4|HEAD