Serhiy Storchaka added the comment:
It works only if input also supports slicing and this slicing is corresponded
to bytes-slicing. It perhaps doesn't catch a non C-continuous buffers.
Actually we need something like (unlikely cast() doesn't work with empty
buffers):
s = memoryview(s)
if not s:
return b''
s = s.cast('B')
...
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<http://bugs.python.org/issue17839>
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