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

In general, I think it's good to have this feature if storage-thing will be solved. In the `offline-plugin` I do some required pre-computations on SW startup. There isn't a lot of work, but I can imagine people doing much more pre-computation on SW startup, because it isn't possible to store global state in SW and requesting data from IDB on each `fetch`/other-event seems a bit weird.

Maybe it isn't slow and perfectly fine, but from a dev perspective it isn't transparent and sounds much worse with "multiple SW instances".

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Other thing is this: does this feature worth complexity? While it makes life easier for Firefox devs, it makes life harder for web-devs, because we will have to handle on consequences. Other point was heavy computations, which as well could be done in SharedWorker without having multiple ServiceWorker instances.

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