reactivemongo.core.actors.MongoDBSystem
(operationHandler: StringAdd).self
(operationHandler: StringFormat).self
(operationHandler: ArrowAssoc[OperationHandler]).x
(Since version 2.10.0) Use leftOfArrow
instead
(operationHandler: Ensuring[OperationHandler]).x
(Since version 2.10.0) Use resultOfEnsuring
instead