[issue15903] Make rawiobase_read() read directly to bytes object

[Antoine Pitrou]

Antoine Pitrou added the comment:

> If either refcount is larger than the expected value of 1, then the
> data is copied rather than resized.

I think that's a useless precaution. The bytes object cannot "leak" since you are using PyMemoryView_FromMemory(), which doesn't know about the original object.

Out of curiousity, have you done any benchmarks?

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nosy: +pitrou

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