From fc73f9058b74d29e87a80a417e36e5b74357b1e3 Mon Sep 17 00:00:00 2001
From: phofl <patrick_hoefler@gmx.net>
Date: Mon, 8 Nov 2021 23:09:15 +0100
Subject: [PATCH 1/2] Fixed regression in Series.duplicated for categorical
 dtype with bool categories

---
 doc/source/whatsnew/v1.3.5.rst                 |  1 +
 pandas/core/algorithms.py                      |  2 +-
 pandas/tests/series/methods/test_duplicated.py | 18 +++++++++++++++++-
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/doc/source/whatsnew/v1.3.5.rst b/doc/source/whatsnew/v1.3.5.rst
index 589092c0dd7e3..d00c400b63b4f 100644
--- a/doc/source/whatsnew/v1.3.5.rst
+++ b/doc/source/whatsnew/v1.3.5.rst
@@ -16,6 +16,7 @@ Fixed regressions
 ~~~~~~~~~~~~~~~~~
 - Fixed regression in :meth:`Series.equals` when comparing floats with dtype object to None (:issue:`44190`)
 - Fixed performance regression in :func:`read_csv` (:issue:`44106`)
+- Fixed regression in :meth:`Series.duplicated` when Series has :class:`Categorical` dtype with boolean categories (:issue:`44351`)
 -
 
 .. ---------------------------------------------------------------------------
diff --git a/pandas/core/algorithms.py b/pandas/core/algorithms.py
index c1b587ce3a6b2..8c2c01b6aedc8 100644
--- a/pandas/core/algorithms.py
+++ b/pandas/core/algorithms.py
@@ -148,7 +148,7 @@ def _ensure_data(values: ArrayLike) -> np.ndarray:
             # i.e. all-bool Categorical, BooleanArray
             try:
                 return np.asarray(values).astype("uint8", copy=False)
-            except TypeError:
+            except (TypeError, ValueError):
                 # GH#42107 we have pd.NAs present
                 return np.asarray(values)
 
diff --git a/pandas/tests/series/methods/test_duplicated.py b/pandas/tests/series/methods/test_duplicated.py
index 5cc297913e851..8e5f81d1326cb 100644
--- a/pandas/tests/series/methods/test_duplicated.py
+++ b/pandas/tests/series/methods/test_duplicated.py
@@ -1,7 +1,11 @@
 import numpy as np
 import pytest
 
-from pandas import Series
+from pandas import (
+    NA,
+    Categorical,
+    Series,
+)
 import pandas._testing as tm
 
 
@@ -33,3 +37,15 @@ def test_duplicated_nan_none(keep, expected):
 
     result = ser.duplicated(keep=keep)
     tm.assert_series_equal(result, expected)
+
+
+def test_duplicated_categorical_bool():
+    # GH#44351
+    ser = Series(
+        Categorical(
+            [True, False, True, False, NA], categories=[True, False], ordered=True
+        )
+    )
+    result = ser.duplicated()
+    expected = Series([False, False, True, True, False])
+    tm.assert_series_equal(result, expected)

From eeba436eab7eef433c3baedda30c1d0be6073790 Mon Sep 17 00:00:00 2001
From: phofl <patrick_hoefler@gmx.net>
Date: Tue, 9 Nov 2021 20:50:29 +0100
Subject: [PATCH 2/2] Add test

---
 doc/source/whatsnew/v1.3.5.rst                    |  2 +-
 .../tests/series/methods/test_drop_duplicates.py  | 15 +++++++++++++++
 pandas/tests/series/methods/test_duplicated.py    |  2 +-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/doc/source/whatsnew/v1.3.5.rst b/doc/source/whatsnew/v1.3.5.rst
index d00c400b63b4f..951b05b65c81b 100644
--- a/doc/source/whatsnew/v1.3.5.rst
+++ b/doc/source/whatsnew/v1.3.5.rst
@@ -16,7 +16,7 @@ Fixed regressions
 ~~~~~~~~~~~~~~~~~
 - Fixed regression in :meth:`Series.equals` when comparing floats with dtype object to None (:issue:`44190`)
 - Fixed performance regression in :func:`read_csv` (:issue:`44106`)
-- Fixed regression in :meth:`Series.duplicated` when Series has :class:`Categorical` dtype with boolean categories (:issue:`44351`)
+- Fixed regression in :meth:`Series.duplicated` and :meth:`Series.drop_duplicates` when Series has :class:`Categorical` dtype with boolean categories (:issue:`44351`)
 -
 
 .. ---------------------------------------------------------------------------
diff --git a/pandas/tests/series/methods/test_drop_duplicates.py b/pandas/tests/series/methods/test_drop_duplicates.py
index 7eb51f8037792..f72d85337df8e 100644
--- a/pandas/tests/series/methods/test_drop_duplicates.py
+++ b/pandas/tests/series/methods/test_drop_duplicates.py
@@ -2,6 +2,7 @@
 import pytest
 
 from pandas import (
+    NA,
     Categorical,
     Series,
 )
@@ -224,6 +225,20 @@ def test_drop_duplicates_categorical_bool(self, ordered):
         assert return_value is None
         tm.assert_series_equal(sc, tc[~expected])
 
+    def test_drop_duplicates_categorical_bool_na(self):
+        # GH#44351
+        ser = Series(
+            Categorical(
+                [True, False, True, False, NA], categories=[True, False], ordered=True
+            )
+        )
+        result = ser.drop_duplicates()
+        expected = Series(
+            Categorical([True, False, np.nan], categories=[True, False], ordered=True),
+            index=[0, 1, 4],
+        )
+        tm.assert_series_equal(result, expected)
+
 
 def test_drop_duplicates_pos_args_deprecation():
     # GH#41485
diff --git a/pandas/tests/series/methods/test_duplicated.py b/pandas/tests/series/methods/test_duplicated.py
index 8e5f81d1326cb..c61492168da63 100644
--- a/pandas/tests/series/methods/test_duplicated.py
+++ b/pandas/tests/series/methods/test_duplicated.py
@@ -39,7 +39,7 @@ def test_duplicated_nan_none(keep, expected):
     tm.assert_series_equal(result, expected)
 
 
-def test_duplicated_categorical_bool():
+def test_duplicated_categorical_bool_na():
     # GH#44351
     ser = Series(
         Categorical(