Unable to create SetMap

[simerplaha]

This following SetMap creating is not possible because it requires a combined serialiser.

implicit val setMapFunctions = Set.Functions[(Long, String), FunctionType]()
val setMap = persistent.SetMap[Long, String, FunctionType, Bag.Less](dir = "mySetMap")

could not find implicit value for parameter serializer: swaydb.serializers.Serializer[(Long, String)] implicit val setMapFunctions = Set.Functions(Long, String), FunctionType