Re: [w3c/ServiceWorker] async waitUntil() does not allow extension on final promise resolution? (#1039)

> you queue a **microtask** upon fulfillment and decrease from that microtask

I think this would satisfy Ben's mental model. This would even work for all sequences:
```js
e.waitUntil(p);
p.then(_ => e.waitUntil(q));
p.then(_ => e.waitUntil(r));

p.then(_ => e.waitUntil(q));
e.waitUntil(p);
p.then(_ => e.waitUntil(r));

p.then(_ => e.waitUntil(q));
p.then(_ => e.waitUntil(r));
e.waitUntil(p);
```

I'm happy with this solution.

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