I'd be surprised if many developers these days actually compared UUIDs case-insensitively, though, even if they're intended to be. Microsoft, which have relied

I'd be surprised if many developers these days actually compared UUIDs case-insensitively, though, even if they're intended to be. Microsoft, which have relied on GUIDs for years going back to their version of DCE/RPC, probably does it right. If it's part of a spec, then it's simpler, but it's still a potential point of surprise.