def save_timestamp_and_nonce(self, client_key, timestamp, nonce,
            request_token=None, access_token=None):
        raise NotImplementedError("Must be implemented by inheriting classes")
NIST: instance.best_prefix returns the same type if nothing changes
dataset/ETHPy150Open ib-lundgren/flask-oauthprovider/flask_oauthprovider.py/OAuthProvider.save_timestamp_and_nonce--crossover with--dataset/ETHPy150Open tbielawa/bitmath/tests/test_best_prefix_NIST.py/TestBestPrefixNIST.test_best_prefix_identical_result