it.registerFactory(SpecialBean) { new SpecialBean(name: it) }
            }
            .registerInstance("s", "other")
            .mutate {
                it.path("beans").type(mmType).action { c ->
                    c.create("b1", Bean)
                    c.create("sb1", SpecialBean)
                    c.withType(SpecialBean, SetProp)
                }
            }