operator fun <T, R> invoke(container: AssertionContainer<T>, action: (AssertionContainer<T>) -> FeatureExpect<T, R>, actionAndApply: (AssertionContainer<T>, Expect<R>.() -> Unit) -> Expect<R>): FeatureExtractorBuilder.ExecutionStep<T, R>
Creates the FinalStep in the context of the SubjectChangerBuilder.