revert cast

Author: andrewgsavage

pandas/core/arrays/arrow/array.py

@@ -1094,8 +1094,7 @@ def round(self, decimals: int = 0, *args, **kwargs) -> Self:
         DataFrame.round : Round values of a DataFrame.
         Series.round : Round values of a Series.
         """
-        result = pc.round(self._pa_array, ndigits=decimals)
-        return type(self)(result.cast(self._pa_array.type))
+        return type(self)(pc.round(self._pa_array, ndigits=decimals))
 
     @doc(ExtensionArray.searchsorted)
     def searchsorted(