reactivemongo.api.commands.IsMasterCommand
(replicaSet: StringAdd).self
(replicaSet: StringFormat).self
(replicaSet: ArrowAssoc[ReplicaSet]).x
(Since version 2.10.0) Use leftOfArrow
instead
(replicaSet: Ensuring[ReplicaSet]).x
(Since version 2.10.0) Use resultOfEnsuring
instead