(addFieldToSet: StringAdd).self
(addFieldToSet: StringFormat).self
(addFieldToSet: ArrowAssoc[AggregationFramework.AddFieldToSet]).x
(Since version 2.10.0) Use leftOfArrow
instead
(addFieldToSet: Ensuring[AggregationFramework.AddFieldToSet]).x
(Since version 2.10.0) Use resultOfEnsuring
instead