[issue28856] %b format for bytes does not support objects that follow the buffer protocol

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +ethan.furman, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28856>
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