Class Sync

src/main/java/fieldbox/boxes/plugins/Pseudo.java:499–574

	}

	static public class Sync implements AsMap {

		private final Box on;

		public Sync(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) {

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

			Object[] o = {null};

			if (c != null) {
				try {
					ThreadSync.inMainThread(() -> {
						o[0] = c.get();
					});
				} catch (InterruptedException e) {
					throw (IllegalArgumentException) new IllegalArgumentException().initCause(e);
				} catch (ExecutionException e) {
					throw (IllegalArgumentException) new IllegalArgumentException().initCause(e);
				}
			}

			return on.properties.put(new Dict.Prop(p), o[0]);
		}


		@Override
		public Object asMap_new(Object a) {