[issue39298] add BLAKE3 to hashlib

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

To anyone else who comes along with motivation:

I'm fine with blake3 being in hashlib, but I don't want us to guarantee it by carrying the implementation of the algorithm in the CPython codebase itself unless it gains wide industry standard-like adoption status.

We should feel free to link to both the Rust blake3 and C blake3-py packages from the hashlib docs regardless.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39298>
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