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

> We're going to observe addEventListener and optimise based on that.

Relevant changes for this and enforcing the early return to all the functional events have been addressed: b80ba58acf5dc4963f6e723734524604005a778c

> addEventListener should throw if it's called after the initial execution of the script.

I'll make a PR to DOM spec for this.

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