scala> val tuple = (1, "2", 3L)
val tuple: (Int, String, Long) = (1, "2", 3L)
scala> 0.0 *: tuple
val res0: (Double, Int, String, Long) = (0.0, 1, "2", 3L)
scala> tuple ++ tuple
val res1: Int *: String *: Long *: tuple.type = (1, "2", 3L, 1, "2", 3L)
