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`)

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