Re: [ServiceWorker] Soft Update and Register can race when setting registration scriptURL (#789)

I think you're right, the spec says it should run synchronously when .register() is called.

As a general note, differences like this are artifacts of how Chrome implemented a register/update/unregister job queue before the spec had them defined (lots of discussion was at #396 ). Chrome should probably fix these but I suspect they are minor differences.

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https://github.com/slightlyoff/ServiceWorker/issues/789#issuecomment-161180022