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Irrelevant instance arguments for _<_ #1998

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@jamesmckinna

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@jamesmckinna

So: (DRAFT)

lead me to conclude that we should add (!?) an irrelevant-instance version of LessThan to Data.Nat.Base, along the analogy with NonZero, and forever after use this relation for 'computational' appeals to _<_, such as in the (old/refactored; mea culpa) definition of fromN<...

... the only question being whether this can already be achieved by back-porting Positive etc. to Data.Nat, as any instance of LessThan m n (sic) defined in terms of _<ᵇ_would eventually reduce to one of Positive k for some k? or else defining Positive in terms of LessThan?

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