review

Author: andrewgsavage

pandas/core/arrays/base.py

@@ -2295,7 +2295,7 @@ def round(self, decimals: int = 0, *args, **kwargs) -> Self:
         # Implementers are encouraged to override this method to avoid
         # elementwise rounding.
         if self.dtype._is_boolean:
-            return self
+            return self.copy()
         if not self.dtype._is_numeric:
             raise TypeError(f"Cannot round {type(self)} dtype as it is non-numeric")
         return self._from_sequence(

pandas/tests/extension/base/methods.py

@@ -731,7 +731,8 @@ def test_equals_same_data_different_object(self, data):
 
     def test_round(self, data):
         if not data.dtype._is_numeric:
-            with pytest.raises(TypeError):
+            msg = "dtype as it is non-numeric"
+            with tm.assert_produces_warning(TypeError, match=msg):
                 data.round()
         elif data.dtype._is_boolean:
             result = pd.Series(data).round()