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

@bkimmel 

> I've used patterns in the past of "hanging" a service worker mid-lifecycle with event.waitUntil

`event.waitUntil` doesn't prevent events of the same type firing. Eg, it doesn't hold up other fetch events.

I get that there's a fear of cuncurrency here, but do you have an example of something you're doing now that would break with concurrency?

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