[issue39298] add BLAKE3 to hashlib

[Jack O'Connor]

Jack O'Connor <oconnor663 at gmail.com> added the comment:

I've just published some Python bindings for the Rust implementation on PyPI: https://pypi.org/project/blake3

> I'm guessing Python is gonna hold off until BLAKE3 reaches 1.0.

That's very fair. The spec and test vectors are set in stone at this point, but the implementations are new, and I don't see any reason to rush things out. (Especially since early adopters can now use the library above.) That said, there aren't really any expected implementation changes that would be a natural moment for the implementations to tag 1.0. I'll probably end up tagging 1.0 as soon as a caller appears who needs it to be tagged to meet their own stability requirements.

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<https://bugs.python.org/issue39298>
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