def METHOD_NAME(self) -> t.Tuple[KT, VT]:
    """*x.popitem() → (k, v)*
    Remove and return some item as a (key, value) pair.
    :raises KeyError: if *x* is empty.
    """
    key, val = self._fwdm.METHOD_NAME()
    del self._invm[val]
    return key, val