def flush(self):
        data = self._wbuf.getvalue()
        if data:
            self._write(data)
        self._len = 0
        self._wbuf = StringIO()
L{MemCacheProtocol.getMultiple} handles an additional cas field in the
dataset/ETHPy150Open natestedman/Observatory/observatory/lib/dulwich/protocol.py/BufferedPktLineWriter.flush--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_memcache.py/MemCacheTestCase.test_getsMultiple