Just what Ethan noted above, and the fact that Ethan should also list himself as a co-author now :)

That said, one major alternative it would be good to consider further between now and 3.7 is Serhiy's "seqtools" idea: https://mail.python.org/pipermail/python-ideas/2016-July/041083.html

Something that wrapped memoryview and allowed bytes-based iteration over any buffer exported would automatically cover bytes and bytearray as well, while also permitting "structure ignoring" iteration over the raw data contained in other types.