Generic deriving ToParamSchema fails for a Tuple

instance ToParamSchema (Int,Int)

fails with

        No instance for (Data.Swagger.Internal.ParamSchema.GToParamSchema
                           (M1
                              C
                              GHC.Generics.C1_0(,)
                              (S1 NoSelector (Rec0 Int) :*: S1 NoSelector (Rec0 Int))))
          arising from a use of ‘Data.Swagger.Internal.ParamSchema.$gdmtoParamSchema’
        In the expression:
          Data.Swagger.Internal.ParamSchema.$gdmtoParamSchema
        In an equation for ‘toParamSchema’:
            toParamSchema = Data.Swagger.Internal.ParamSchema.$gdmtoParamSchema
        In the instance declaration for ‘ToParamSchema (Int, Int)’

I would expect it to end up something like

  "parameters": [
      {
          "required": true,
          "schema": {
              "items": [
                  {
                      "maximum": 9223372036854775807,
                      "minimum": -9223372036854775808,
                      "type": "integer"
                  },
                  {
                      "maximum": 9223372036854775807,
                      "minimum": -9223372036854775808,
                      "type": "integer"
                  }
              ],
              "type": "array"
          },
          "in": "body",
          "name": "body"
      }