Decidable congruence relations for Haskell: up to you whether this is a joke

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MIT licensed by Jonathan Sterling
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The laws of Eq only require that you have a decidable equivalence relation defined on a type; they do not force you to guarantee abstraction with respect to the relation, i.e. you can write anti-extensional operations without violating the laws. This package provides an alternative for when functionality with respect to an equivalence relation is desired.

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