What's new in 1.5.3 (December ??, 2022)

These are the changes in pandas 1.5.3. See :ref:`release` for a full changelog including other versions of pandas.

Fixed regressions

Fixed performance regression in :meth:`Series.isin` when values is empty (:issue:`49839`)
Fixed regression in :meth:`DataFrameGroupBy.transform` when used with as_index=False (:issue:`49834`)
Enforced reversion of color as an alias for c and size as an alias for s in function :meth:`DataFrame.plot.scatter` (:issue:`49732`)
Fixed regression in :meth:`SeriesGroupBy.apply` setting a name attribute on the result if the result was a :class:`DataFrame` (:issue:`49907`)

Bug in :meth:`.Styler.to_excel` leading to error when unrecognized border-style (e.g. "hair") provided to Excel writers (:issue:`48649`)
Bug in :meth:`.Timestamp.floor` fixed tz_localize so 'ambiguous' parameter can only be True, False, 'NaT' or 'raise' and all other invalid arguments to ambiguous have same error, including 'infer' (:issue:`49565`)

Modified test cases in test_timezones.py to reflect new error message from bug fix for bug: (:issue:`49565`)

.. contributors:: v1.5.2..v1.5.3|HEAD