[issue1751] Fast BytesIO implementation + misc changes

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Since nothing happened for almost one month here, perhaps it would be
better to merge Alexandre's changes as they are? We'll see quickly if
unexpected things happen :-)

It would also allow to progress on other issues, e.g. #2523.

Also, I stand by the suggestion I made about the resizing logic, but it
shouldn't be a showstopper either. We can improve that later.

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