If you get to read this before it fades away from /new, I hope you enjoy it. I'm quite into entropy representation, and this is my best attempt at database IDs in REST APIs.
It doesn't have a checksum, though, that seems like an improvement that's worth a few bytes.
The formalization interests me. Shame they shifted the UUID 2 bits right. Otherwise our implementations would be almost compatible (only the last 2 bits of the 26th character + the last 3 characters would differ). In my next clean codebase, I may use TypeID and append a 15-bit checksum.