[w3c/ServiceWorker] Is respondWith(fetch(event.request)) always the same as not calling respondWith()? (#1395)

At the  [Loading Signed Exchanges](https://wicg.github.io/webpackage/loading.html) spec, the service worker interaction is defined such that `respondWith(fetch(event.request))` produces different behavior than not calling `respondWith()`.

I'm know we've historically tried to keep this the same. Are there any other known cases where these differ?

I've also filed https://github.com/WICG/webpackage/issues/409 for the specific issue of SXG and service worker interaction.

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