[issue2538] memoryview of bytes is not readonly

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

This patch looks good.

One question: in Objects/abstract.c in PyBuffer_FillInfo, why is it even
testing for the PyBUF_LOCK flag at all?  PEP 3118 says its valid for
both reading and writing (if the underlying object supports locked access).

BTW, I is someone is going to merge any py3k buffer api related changes
back into the backport that is in 2.6?

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