def thenNullCheck[A, B, C](f: A => B, g: B => C) = {
  optional(f).andThen(optional(g))
}
val nullCheckedComposition = thenNullCheck(getUser, getInfo)  // nullCheckedComposition: Long => Info
nullCheckedComposition(null.asInstanceOf[Int])                // res10: Info = null
nullCheckedComposition(123)                                   // res11: Info = Info(Tom)
nullCheckedComposition(1234)                                  // res12: Info = null