The `difflib.SequenceMatcher` ratio between the state addresses in the history of the path.
        :param state_a: The first state to compare
        :param state_b: The second state to compare

def sequence_matcher_similarity(state_a, state_b):
        """
        The `difflib.SequenceMatcher` ratio between the state addresses in the history of the path.
        :param state_a: The first state to compare
        :param state_b: The second state to compare
        """
        addrs_a = tuple(state_a.history.bbl_addrs)
        addrs_b = tuple(state_b.history.bbl_addrs)
        return SequenceMatcher(a=addrs_a, b=addrs_b).ratio()