[issue23001] Accept mutable bytes-like objects

[Martin Panter]

Martin Panter added the comment:

If this goes ahead, it would be nice adding notes to the documentation saying that bytearray() or whatever was previously not supported. There are APIs in Python 2.6 that had similar treatment with no documentation updates, and I keep being bitten by it.

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<http://bugs.python.org/issue23001>
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