Class Oncer

src/main/java/fieldbox/boxes/plugins/Pseudo.java:428–497

	}

	static public class Oncer implements AsMap {

		private final Box on;

		public Oncer(Box on) {
			this.on = on;
		}

		@Override
		public boolean asMap_isProperty(String s) {
			return true;
		}

		@Override
		public Object asMap_call(Object o, Object o1) {
			return asMap_getElement(o1);
		}

		@Override
		public Object asMap_getElement(Object element) {
			return asMap_get(element + "");
		}

		@Override
		public Object asMap_setElement(int element, Object o) {
			return null;
		}

		@Override
		public Object asMap_get(String p) {
			return null;
		}

		@Override
		public Object asMap_set(String p, Object val) {

			Dict.Prop cc = new Dict.Prop(p);

			Dict.Prop canon = cc.findCanon();
			if (canon != null) cc = canon;

			if (cc.getAttributes().isTrue(readOnly, false))
				throw new IllegalArgumentException("can't write to property '" + p + "', property is read-only");

			Supplier s = (Supplier) Conversions.convert(val, Supplier.class);

			return on.properties.computeIfAbsent(cc, x -> s.get());
		}


		@Override
		public Object asMap_new(Object a) {
			return null;
		}

		@Override
		public Object asMap_new(Object a, Object b) {
			return null;