Re: [w3c/ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

For what it's worth, one of [the more prominent guides to the Push API](https://developer.mozilla.org/en-US/docs/Web/API/Push_API/Using_the_Push_API) depends on [global state being maintained in a service worker](https://github.com/chrisdavidmills/push-api-demo/blob/gh-pages/sw.js) (i.e. a `MessagePort`).

But that's probably bad already even without concurrency, right, since user agents can already shut a SW down at any time it doesn't have events to keep it alive?

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