Re: [w3c/ServiceWorker] CORS preflight for static import in a module service worker (#1574)

So it seems we need to move the "Append `Service-Worker`/`script` to request’s header list." step from:

https://w3c.github.io/ServiceWorker/#update-algorithm


Step 9 substep 1 to be after substep 4 where "is top-level flag" check is made.

Maybe we should file a separate issue for byte-for-byte update checking issues with es modules.

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