(Since version 0.18.5) Use the constructor with isMongos
(setAvailable: StringAdd).self
(setAvailable: StringFormat).self
(setAvailable: ArrowAssoc[SetAvailable]).x
(Since version 2.10.0) Use leftOfArrow
instead
(setAvailable: Ensuring[SetAvailable]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
(Since version 0.16.0) Internal: will be made private