adding whatsnew note

realead · realead · commit 9c5bcdcc23a5 · 2021-10-18T20:07:53.000+02:00
diff --git a/doc/source/whatsnew/v1.4.0.rst b/doc/source/whatsnew/v1.4.0.rst
@@ -504,6 +504,7 @@ Missing
 ^^^^^^^
 - Bug in :meth:`DataFrame.fillna` with limit and no method ignores axis='columns' or ``axis = 1`` (:issue:`40989`)
 - Bug in :meth:`DataFrame.fillna` not replacing missing values when using a dict-like ``value`` and duplicate column names (:issue:`43476`)
+- :meth:`Series.value_counts` and :meth:`Series.mode` no longer coerce ``None``, ``NaT`` and other null-values to a NaN-value for ``np.object``-dtype. This behavior is now consistent with ``unique``, ``isin`` and others (:issue:`42688`)
 -
 
 MultiIndex

Original file line number	Diff line number	Diff line change
`@@ -504,6 +504,7 @@ Missing`
`504`	`504`	`^^^^^^^`
`505`	`505`	- Bug in :meth:`DataFrame.fillna` with limit and no method ignores axis='columns' or ``axis = 1`` (:issue:`40989`)
`506`	`506`	- Bug in :meth:`DataFrame.fillna` not replacing missing values when using a dict-like ``value`` and duplicate column names (:issue:`43476`)
	`507`	+- :meth:`Series.value_counts` and :meth:`Series.mode` no longer coerce ``None``, ``NaT`` and other null-values to a NaN-value for ``np.object``-dtype. This behavior is now consistent with ``unique``, ``isin`` and others (:issue:`42688`)
`507`	`508`	`-`
`508`	`509`
`509`	`510`	`MultiIndex`