https://github.com/berkerpeksag/notes/blob/master/python/memoryview.md
http://bugs.python.org/issue15944
On how useless memoryviews seem to be, maybe only when no buffer interface defined ?
Hmm, they can be handy when buffer interface is defined
https://jakevdp.github.io/blog/2014/05/05/introduction-to-the-python-buffer-protocol/
C level underpinning of buffer interface
http://python.6.x6.nabble.com/Buffer-protocol-for-io-BytesIO-td1902991.html
See