Daniel Micay 4d7d101a76 create a sensible comparison trait hierarchy
* `Ord` inherits from `Eq`
* `TotalOrd` inherits from `TotalEq`
* `TotalOrd` inherits from `Ord`
* `TotalEq` inherits from `Eq`

This is a partial implementation of #12517.
2014-03-07 22:45:22 -05:00
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