What's new in 1.3.4 (October ??, 2021)

These are the changes in pandas 1.3.4. See :ref:`release` for a full changelog including other versions of pandas.

Fixed regressions

Fixed regression in :meth:`merge` with integer and NaN keys failing with outer merge (:issue:`43550`)
Fixed performance regression in :meth:`MultiIndex.equals` (:issue:`43549`)
Fixed regression in :meth:`Series.cat.reorder_categories` failing to update the categories on the Series (:issue:`43232`)
Fixed regression in :meth:`Series.cat.categories` setter failing to update the categories on the Series (:issue:`43334`)
Fixed regression in :meth:`DataFrame.corr` raising ValueError with method="spearman on 32-bit platforms (:issue:`43588`)

Fixed bug in :meth:`.GroupBy.mean` with datetimelike values including NaT values returning incorrect results (:issue`:43132`)

.. contributors:: v1.3.3..v1.3.4|HEAD