Review, cryptography: `rblake2sum` - Recursive file system digest

I needed a cryptographically secure digest function of a content of a directory. I’ve just published rblake2sum and the library it’s based on crev-recursive-digest. I would really appreciate someone looking at it and telling me what they think.

I’m working on cargo-crev and it’s going to be one of a building blocks, and it would be terrible, if in few monthds it turned out my implementation is buggy or my algorithm unsound.

Thank you!

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