def key(self, source_string):
        return (super(L20NTests, self).key(source_string)
            .lower()
            .replace(' ', '_')
            .replace('-', '_'))
Implements :func:`autobahn.wamp.interfaces.IObjectSerializer.unserialize`
dataset/ETHPy150Open mozilla/pontoon/pontoon/sync/tests/formats/test_l20n.py/L20NTests.key--crossover with--dataset/ETHPy150Open crossbario/autobahn-python/autobahn/wamp/serializer.py/JsonObjectSerializer.unserialize