[issue1751] Fast BytesIO implementation + misc changes

[Alexandre Vassalotti]

Alexandre Vassalotti added the comment:

[grrr, I eat my words]

> So, here's one big patch. I have updated the behavior of close(), so that 

... it matches the behavior of 2.x.

> As a side-effect, this make __next__ raises a
ValueError, instead of StopIteration.

... when the file is closed.

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