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Thanks to the PEP 442 (Safe object finalization), _TracebackLogger helper of asyncio.Futures becomes useless.
Attached patch removes it.
--
If you agree to diverge code with Tulip project, the Python 3.3 code of WriteTransport.writelines can also be removed:
 if not PY34:
 # In Python 3.3, bytes.join() doesn't handle memoryview.
 list_of_data = (
 bytes(data) if isinstance(data, memoryview) else data
 for data in list_of_data)