Total equality relations as `std::cmp::Eq<Rhs>`

[steffahn]

There’s also prior topic(s?) on this question

Why don't `Eq` and `Ord` have a `Rhs` parameter (anymore)?

I see that way back (pre-1.0) when Stabilize cmp by aturon · Pull Request #20065 · rust-lang/rust · GitHub was merged, it removed the Rhs type parameter from the Eq and Ord traits but not from the PartialEq and PartialOrd traits: However, RFC 439 that it was apparently implementing specifically proposed a Rhs parameter for those traits. Neither in the discussions around the RFC nor those around the stabilisation PR can I see very much that explains why the parameter was removed: all I have f…

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