Zwaluw for JSON?

[MedeaMelana]

We could look into writing JSON instances for the json package in Zwaluw-style. Would make it clearer how to split Zwaluw into something bidirectional-generic and something URL-specific.

http://hackage.haskell.org/package/json

[sjoerdvisscher]

So not just JSON datatype to String and back, like I first thought, but also any datatype to JSON and back.