(updateCommand: StringAdd).self
(updateCommand: StringFormat).self
(Since version 0.17.0) Will be private/internal
(updateCommand: ArrowAssoc[UpdateCommand[P]]).x
(Since version 2.10.0) Use leftOfArrow instead
(updateCommand: Ensuring[UpdateCommand[P]]).x
(Since version 2.10.0) Use resultOfEnsuring instead
Implements the update command.
(Since version 0.16.0) Use the new update operation