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No cipher construction function _currently_ returns NULL, but one's about to start, so the testcrypt system will have to be able to cope. This is the first time a function in the testcrypt API has had an 'opt' type as its return value rather than an argument. But it works just the same in reverse: the wire protocol emits the special identifer "NULL" when the optional return value is absent, and the Python module catches that and rewrites it as Python 'None'.