Class C1

packages/svelte/tests/signals/test.ts:120–128

		var obj = state<any>(undefined);

		class C1 {
			#v = state(0);
			get v() {
				return $.get(this.#v);
			}
			set v(v: number) {
				set(this.#v, v);
			}
		}

		return () => {
			let d = derived(() => $.get(obj)?.v || '-');