[issue22003] BytesIO copy-on-write

[Antoine Pitrou]

Antoine Pitrou added the comment:

I don't like the idea of trying to hash the object. It may be a time-consuming operation, while the result will be thrown away.

I think restricting the optimization to bytes objects is fine. We can whitelist other types, such as memoryview.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22003>
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