mypy fix

WillAyd · WillAyd · commit 96f080d94f24 · 2023-08-28T10:59:05.000-04:00
diff --git a/pandas/core/arrays/masked.py b/pandas/core/arrays/masked.py
@@ -198,6 +198,7 @@ def __getitem__(self, item: PositionalIndexer) -> Self | Any:
                 return self.dtype.na_value
             return self._data[item]
 
+        assert not isinstance(newmask, bool)  # for mypy
         return self._simple_new(self._data[item], newmask)
 
     def pad_or_backfill(
