(nodeValidator: (Param[NodeT, EI]) ⇒ Boolean).andThen(g)
(nodeValidator: (Param[NodeT, EI]) ⇒ Boolean).apply(v1)
(nodeValidator: (Param[NodeT, EI]) ⇒ Boolean).compose(g)
(nodeValidator: OuterNode[NodeValidator]).toString()
(nodeValidator: (Param[NodeT, EI]) ⇒ Boolean).toString()