Re: [ServiceWorker] Proposal: Optimized No-Fetch Service Workers (#718)

>From implementation & optimization pov it'd be definitely good if we can clearly say listeners should be added to the SW global during initialization somewhere in the spec.  On the other hand if we decide not to spec it out (e.g. for not promoting such usage) there seems to be still a way to optimize the implementation without affecting the Web-facing behavior, though the code would become less clean.

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