def normkey(self, key):
        return key.lower()
Test serializable handler works with MR and shard retry.
dataset/ETHPy150Open wcong/ants/ants/utils/datatypes.py/CaselessDict.normkey--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/appengine-mapreduce/python/test/mapreduce/end_to_end_test.py/EndToEndTest.testHandlerSerialization