@_require_mech
    def unwrap(self, incoming):
        return self._chosen_mech.unwrap(incoming)
Returns the actual upstream version (without dev info)
dataset/ETHPy150Open thobbs/pure-sasl/puresasl/client.py/SASLClient.unwrap--crossover with--dataset/ETHPy150Open couchbase/couchbase-python-client/couchbase_version.py/VersionInfo.base_version