Method __deepcopy__

xarray/core/dataarray.py:1365–1366

(self, memo: dict[int, Any] | None = None)

        return self._copy(deep=False)

    def __deepcopy__(self, memo: dict[int, Any] | None = None) -> Self:
        return self._copy(deep=True, memo=memo)

    # mutable objects should not be Hashable
    # https://github.com/python/mypy/issues/4266