feat: Support generics.

[itsdevbear]

Useful, safe and I don't really see any downsides.

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[itsdevbear]

@potuz

[potuz]

Apologies for the delay, got dug in mailbox for some reason. I assume the usecase you want is to have flat byte slices for usecases? I agree this may be a cleaner solution. Could you add unit tests that check for both these paths with [][32]byte and []byte as arguments? As a plus, if you could provide benches on both attached to this PR that'd be great.