(booleanFunctionBridge: StringAdd).self
(booleanFunctionBridge: StringFormat).self
(booleanFunctionBridge: ArrowAssoc[BooleanFunctionBridge[T]]).x
(Since version 2.10.0) Use leftOfArrow instead
(booleanFunctionBridge: Ensuring[BooleanFunctionBridge[T]]).x
(Since version 2.10.0) Use resultOfEnsuring instead
(Since version 2.0) Do not use this directly, use subclasses of this