if isinstance(generate_unique_id_function, DefaultPlaceholder):
            current_generate_unique_id: Callable[[APIRoute], str] = (
                generate_unique_id_function.value
            )
        else:
            current_generate_unique_id = generate_unique_id_function
        self.unique_id = self.operation_id or current_generate_unique_id(self)
        # normalize enums e.g. http.HTTPStatus