Proposal #2560 again: add newtype Down/ReverseOrd to Data.Ord

[Sittampalam, Ganesh]

Twan wrote:

> kahl at cas.mcmaster.ca wrote:

> > -- intended for |qualified| import |as Ord|:
> > newtype Dual a = Dual { unDual :: a } deriving Eq

> In my opinion "dual" is even worse:

"opposite"?

I'm also happy with anything suggested already.

Ganesh

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