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2311d55rename O into Zraichoo e8c2badType class resolution fix (disables Decidable.Decidable) Instances should not be resolved when there is no information available. Previously, resolution just guessed at an instance in this case, though this was never intended behaviour!Edwin Brady 7bfa10cSome unification fixesEdwin Brady 75e5a39Converted Preorder and Poset to typeclassesJan Bessai e12ef39Generalization of Decidable general axioms for Preorders and Posets instance for less-than-equal on NatJan Bessai