Serhiy Storchaka added the comment:

memoryview is converted to bytes because len() for memoryview returns a size of 
first dimension (a number of items for one-dimension view), not a number of 
bytes.

>>> m = memoryview(array.array('I', [1, 2, 3]))
>>> len(m)
3
>>> len(m.tobytes())
12
>>> len(m.cast('B'))
12

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23688>
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