def _unescape(self, value):
        return value.replace('\\\\', '\\')
Assert that passing a non-list is caught in expose headers.
dataset/ETHPy150Open rvanlaar/easy-transifex/src/transifex/transifex/resources/formats/mozillaproperties.py/MozillaPropertiesHandler._unescape--crossover with--dataset/ETHPy150Open openstack/oslo.middleware/oslo_middleware/tests/test_cors.py/CORSTestLatentProperties.test_invalid_latent_expose_headers