(identity: Aux[Input, Aux[OutputData, OutputDelta]]).forward
(identity: StringAdd).self
(identity: StringFormat).self
(identity: ArrowAssoc[Identity[Data0, Delta0]]).x
(Since version 2.10.0) Use leftOfArrow
instead
(identity: Ensuring[Identity[Data0, Delta0]]).x
(Since version 2.10.0) Use resultOfEnsuring
instead