def _values_for_argsort(self) -> np.ndarray:
data = self._data.copy()<EOL>data[self._mask] = data.min() - <NUM_LIT:1><EOL>return data<EOL>
Return values for sorting.

        Returns
        -------
        ndarray
            The transformed values should maintain the ordering between values
            within the array.

        See Also
        --------
        ExtensionArray.argsort