attenuation: Subtyping relations and variance roles

This lets you coerce containers (among other things) from stronger types to weaker types with zero runtime cost when it's safe to do so, e.g. [Fin n] -> [Int]. This primarily comes into play when using newtypes to impose additional invariants on existing types.

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• attenuation-0.2.0.tar.gz [browse] (Cabal source package)
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• AndrewPritchard

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