anchor.diff:  
       override __.RenderInput (_, _, value) =
           value :?> JArray
  -        |> normalizeJArray
           |> Seq.map formatValue
           |> formatMultiLineList
   
  
positive.code:     inherit GeneratorExercise()
  
      override __.RenderExpected (_, _, value) =
          (value :?> JArray)
          |> normalizeJArray
          |> Seq.map formatValue
          |> formatList
  
  
negative.code:         match key with
          | "grid" -> 
              value :?> JArray
              |> Seq.map formatValue
              |> formatMultiLineList
          | _ -> 
  