Making Layer Construction Lazy

const Tag = Context.Tag<number>();

// the same applies to Effect.suspend
const tag = Layer.effect(
  Tag,
  Effect.gen(function* (_) {
    yield* _(Effect.log("constructing..."));
    const num = Math.random();
    yield* _(Effect.log("layer constructed"));
    return num
  })
);

const prog = Effect.gen(function* (_) {
  yield* _(Effect.log("starting..."));
  // I assumed layer Tag will only get constructed when requested here or anywhere else. The layer still gets constructed even when not used i.e if I comment out the line below
  const num = yield* _(Tag);
  yield* _(Effect.log("running..." + num));
});

prog.pipe(Effect.provide(tag), Effect.runFork)