Implements path matching adhering to RFC 6265.

def _is_path_match(req_path: str, cookie_path: str) -> bool:
        """Implements path matching adhering to RFC 6265."""
        if not req_path.startswith("/"):
            req_path = "/"

        if req_path == cookie_path:
            return True

        if not req_path.startswith(cookie_path):
            return False

        if cookie_path.endswith("/"):
            return True

        non_matching = req_path[len(cookie_path):]

        return non_matching.startswith("/")