Box: use a newtype in the model #229
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This improves typechecking slightly since we know `box` is fresh. Also, if we happen to `friend` this module, typeclass resolution will not confuse the instances for references and boxes.
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This improves typechecking slightly since we know
boxis fresh. Also, if we happen tofriendthis module, typeclass resolution will not confuse the instances for references and boxes.