(booleanField: StringAdd).self
(booleanField: StringFormat).self
(booleanField: ArrowAssoc[BooleanField]).x
(Since version 2.10.0) Use leftOfArrow
instead
(booleanField: Ensuring[BooleanField]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
(Since version 0.13.0) Will be removed