From 96f85acebe7e5858b937c3f8ed367b9b3b8a4a34 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 17 Dec 2025 11:03:21 -0800
Subject: [PATCH 1/2] BUG: Allow is_bool_indexer to recognize
 NumpyExtensionArray

---
 pandas/core/common.py                     | 4 +++-
 pandas/tests/indexes/ranges/test_range.py | 6 ++++++
 pandas/tests/test_common.py               | 6 ++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/pandas/core/common.py b/pandas/core/common.py
index b6aab3ddfee63..7b6ba2d9010a7 100644
--- a/pandas/core/common.py
+++ b/pandas/core/common.py
@@ -45,6 +45,7 @@
     ABCExtensionArray,
     ABCIndex,
     ABCMultiIndex,
+    ABCNumpyExtensionArray,
     ABCSeries,
 )
 from pandas.core.dtypes.inference import iterable_not_string
@@ -128,7 +129,8 @@ def is_bool_indexer(key: Any) -> bool:
         and convert to an ndarray.
     """
     if isinstance(
-        key, (ABCSeries, np.ndarray, ABCIndex, ABCExtensionArray)
+        key,
+        (ABCSeries, np.ndarray, ABCIndex, ABCExtensionArray, ABCNumpyExtensionArray),
     ) and not isinstance(key, ABCMultiIndex):
         if key.dtype == np.object_:
             key_array = np.asarray(key)
diff --git a/pandas/tests/indexes/ranges/test_range.py b/pandas/tests/indexes/ranges/test_range.py
index 1f9df30d60c11..a7aca7b8dfe47 100644
--- a/pandas/tests/indexes/ranges/test_range.py
+++ b/pandas/tests/indexes/ranges/test_range.py
@@ -710,6 +710,12 @@ def test_take_return_rangeindex():
     tm.assert_index_equal(result, expected, exact=True)
 
 
+def test__getitem__boolean_numpyextensionarray():
+    ri = RangeIndex(1)
+    result = ri[pd.arrays.NumpyExtensionArray(np.array([True]))]
+    tm.assert_index_equal(ri, result)
+
+
 @pytest.mark.parametrize(
     "rng, exp_rng",
     [
diff --git a/pandas/tests/test_common.py b/pandas/tests/test_common.py
index 9f68ef5ffdc47..d049b89423aab 100644
--- a/pandas/tests/test_common.py
+++ b/pandas/tests/test_common.py
@@ -236,6 +236,12 @@ def test_frozenlist(self):
         expected = df[[]]
         tm.assert_frame_equal(result, expected)
 
+    @pytest.mark.parametrize("scalar", [1, True])
+    def test_numpyextensionarray(self, scalar):
+        # GH 63391
+        arr = pd.arrays.NumpyExtensionArray(np.array([scalar]))
+        assert com.is_bool_indexer(arr) is isinstance(scalar, bool)
+
 
 @pytest.mark.parametrize("with_exception", [True, False])
 def test_temp_setattr(with_exception):

From 2255ce4427e2fea9a79a6c82e016aa7b8494b293 Mon Sep 17 00:00:00 2001
From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Date: Wed, 17 Dec 2025 13:13:42 -0800
Subject: [PATCH 2/2] Add >1 length mask test

---
 pandas/tests/indexes/ranges/test_range.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pandas/tests/indexes/ranges/test_range.py b/pandas/tests/indexes/ranges/test_range.py
index a7aca7b8dfe47..2cf8febc41671 100644
--- a/pandas/tests/indexes/ranges/test_range.py
+++ b/pandas/tests/indexes/ranges/test_range.py
@@ -716,6 +716,18 @@ def test__getitem__boolean_numpyextensionarray():
     tm.assert_index_equal(ri, result)
 
 
+@pytest.mark.parametrize(
+    "container",
+    [np.array, pd.Series, lambda x: pd.arrays.NumpyExtensionArray(np.array(x))],
+    ids=["numpy-array", "series", "numpy-extension-array"],
+)
+def test__getitem__boolean_arraylike(container):
+    ri = RangeIndex(5)
+    result = ri[container([True, True, False, False, True])]
+    expected = Index([0, 1, 4], dtype="int64")
+    tm.assert_index_equal(result, expected)
+
+
 @pytest.mark.parametrize(
     "rng, exp_rng",
     [