[gpm]

It's absolutely intentional, and it's got being technically correct on its side, it's just frustrating.

[oxnrtr]

Not really. That Rust forced total order and partial order into a sub-typing relation is a completely unnecessary, self-inflicted wound.

[steveklabnik]

Many folks do consider this a mistake. Some do still think it was the right call. I'd say it's very unclear.