Re: [ServiceWorker] setTimeout/setInterval are unreliable in ServiceWorkers (#838)

Right, we explicitly only want work to be done in the context of a functional event.  We don't want people visiting a site once and then later discover that site has been mining bitcoin in the background.  So arbitrary long running operations are explicitly not supported outside of functional events.

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https://github.com/slightlyoff/ServiceWorker/issues/838#issuecomment-188509169