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Compilation Error with lens-4.20 #43

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@recursion-ninja

The version lens-4.20 has been created (though not published) for compatibility with ghc-9.0-rc1. Among the changes with lens-4.20 is dropping the Swapped typeclass in exchange for the Swap class from the assoc package (see lens changelog).

This means that validation will not be compatible with ghc-9.0.

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