Merge branch 'master' into whatsnew_1.2

doc/source/whatsnew/v1.2.0.rst

@@ -470,12 +470,13 @@ Deprecations
 - Deprecated :meth:`Index.is_all_dates` (:issue:`27744`)
 - The default value of ``regex`` for :meth:`Series.str.replace` will change from ``True`` to ``False`` in a future release. In addition, single character regular expressions will *not* be treated as literal strings when ``regex=True`` is set. (:issue:`24804`)
 - Deprecated automatic alignment on comparison operations between :class:`DataFrame` and :class:`Series`, do ``frame, ser = frame.align(ser, axis=1, copy=False)`` before e.g. ``frame == ser`` (:issue:`28759`)
-- :meth:`.Rolling.count` with ``min_periods=None`` will default to the size of the window in a future version (:issue:`31302`)
-- Deprecated slice-indexing on timezone-aware :class:`.DatetimeIndex` with naive ``datetime`` objects, to match scalar indexing behavior (:issue:`36148`)
-- :meth:`Index.ravel` returning an ``np.ndarray`` is deprecated, in the future this will return a view on the same index (:issue:`19956`)
-- Deprecated use of strings denoting units with 'M', 'Y' or 'y' in :func:`~pandas.to_timedelta` (:issue:`36666`)
-- :class:`Index` methods ``&``, ``|``, and ``^`` behaving as the set operations :meth:`Index.intersection`, :meth:`Index.union`, and :meth:`Index.symmetric_difference`, respectively, are deprecated and in the future will behave as pointwise boolean operations matching Series behavior. Use the named set methods instead (:issue:`36758`)
-- :meth:`Categorical.is_dtype_equal` and :meth:`CategoricalIndex.is_dtype_equal` are deprecated and will be removed in a future version (:issue:`37545`)
+- :meth:`Rolling.count` with ``min_periods=None`` will default to the size of the window in a future version (:issue:`31302`)
+- Using "outer" ufuncs on DataFrames to return 4d ndarray is now deprecated. Convert to an ndarray first (:issue:`23743`)
+- Deprecated slice-indexing on timezone-aware :class:`DatetimeIndex` with naive ``datetime`` objects, to match scalar indexing behavior (:issue:`36148`)
+- :meth:`Index.ravel` returning a ``np.ndarray`` is deprecated, in the future this will return a view on the same index (:issue:`19956`)
+- Deprecate use of strings denoting units with 'M', 'Y' or 'y' in :func:`~pandas.to_timedelta` (:issue:`36666`)
+- :class:`Index` methods ``&``, ``|``, and ``^`` behaving as the set operations :meth:`Index.intersection`, :meth:`Index.union`, and :meth:`Index.symmetric_difference`, respectively, are deprecated and in the future will behave as pointwise boolean operations matching :class:`Series` behavior. Use the named set methods instead (:issue:`36758`)
+- :meth:`Categorical.is_dtype_equal` and :meth:`CategoricalIndex.is_dtype_equal` are deprecated, will be removed in a future version (:issue:`37545`)
 - :meth:`Series.slice_shift` and :meth:`DataFrame.slice_shift` are deprecated, use :meth:`Series.shift` or :meth:`DataFrame.shift` instead (:issue:`37601`)
 - Partial slicing on unordered :class:`.DatetimeIndex` objects with keys that are not in the index is deprecated and will be removed in a future version (:issue:`18531`)
 - The ``how`` keyword in :meth:`PeriodIndex.astype` is deprecated and will be removed in a future version, use ``index.to_timestamp(how=how)`` instead (:issue:`37982`)