Simple Enums 🔗

Simple enums are (de)serialized as JSON strings.
By "simple" we mean an enum that only has "singleton cases" as defined in the docs.
That is, enum who's cases don't have a parameter clause.

            enum Semaphore derives JsonRW:
  case Red, Yellow, Green

val semaphore = Semaphore.Red
println(semaphore.toJson)
// "Red"