add code sample for pandas-dev#42107

Author: simonjayhawkins

bisect/42107.py

@@ -0,0 +1,15 @@
+# BUG: 1.3.0rc Series.mode errors with BooleanDtype series containing nans #42107
+
+import pandas as pd
+
+print(pd.__version__)
+
+
+s = pd.Series([True, False, True, pd.NA], dtype="boolean")
+
+result = s.mode()
+print(result)
+
+expected = pd.Series([True], dtype="boolean")
+
+pd.testing.assert_series_equal(result, expected)