I feel like understanding the guarantees is really simple. A value can be unique while still being guessable, and that's the idea with this latest revision. If

I feel like understanding the guarantees is really simple. A value can be unique while still being guessable, and that's the idea with this latest revision. If you want something to be unique and unguessable, that's another uuid (or just use random bits, there's no benefit to a uuid here, generally).