Update the set, keeping only elements found in it and all *iterables*.

def intersection_update(self, *iterables):
        """
        Update the set, keeping only elements found in it and all *iterables*.
        """
        _set = self._set
        _list = self._list
        _set.intersection_update(*iterables)
        _list.clear()
        _list.update(_set)
        return self