(routerRoutees: StringAdd).self
(routerRoutees: StringFormat).self
(routerRoutees: ArrowAssoc[RouterRoutees]).x
(Since version 2.10.0) Use leftOfArrow
instead
(routerRoutees: Ensuring[RouterRoutees]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
Message used to carry information about what routees the router is currently using.