Method asMap_set

src/main/java/fieldbox/boxes/Box.java:891–895

(String p, Object o)

		public boolean asMap_delete(Object o) {
			return false;
		}

		@Override
		public Object asMap_set(String p, Object o) {
			return from.properties.computeIfAbsent(storageProperty, (k) -> autoconstructor.apply(from))
				.asMap_set(p, o);
		}