[issue22003] BytesIO copy-on-write

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Pretty sure this approach is broken. What about the alternative approach of specializing for Bytes?

That would certainly sound good enough, to optimize the common case.

Also, it would be nice if you could add some tests to the patch (e.g. to stress the bytearray case). Thank you!

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<http://bugs.python.org/issue22003>
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