[docs] [issue20699] Document that binary IO classes work with bytes-likes objects

Serhiy Storchaka report at bugs.python.org
Fri Jun 3 03:18:49 EDT 2016

Serhiy Storchaka added the comment:

Since the _pyio implementation doesn't support general memoryview-like objects, I consider using the new buffer protocol in the C implementation an implementation detail. Other implementations can lack this support. I think it would be better to left the wording more general ("preallocated writable array of bytes"), but mention other concrete example (array('b'), are there other examples in the stdlib?).


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