BUG: PeriodIndex fails to handle NA, rather than putting NaT in its place (pandas-dev#46673)

Author: kapiliyer

pandas/_libs/tslibs/timedeltas.pyx

@@ -28,6 +28,7 @@ from cpython.datetime cimport (
 
 import_datetime()
 
+
 cimport pandas._libs.tslibs.util as util
 from pandas._libs.tslibs.base cimport ABCTimestamp
 from pandas._libs.tslibs.conversion cimport (

pandas/tests/arrays/categorical/test_indexing.py

@@ -206,7 +206,7 @@ def test_periodindex_on_null_types(self, null_val):
         # GH 46673
         result = PeriodIndex(["2022-04-06", "2022-04-07", null_val], freq="D")
         expected = PeriodIndex(["2022-04-06", "2022-04-07", "NaT"], dtype="period[D]")
-        assert type(result[2]) == type(NaT)
+        assert result[2] is NaT
         tm.assert_index_equal(result, expected)
 
     @pytest.mark.parametrize("new_categories", [[1, 2, 3, 4], [1, 2]])