Re: [w3c/ServiceWorker] should sec-ch-ua headers be visible in FetchEvent.request.headers (#1525)

> Is the content of these headers defined anywhere? It isn't clear what they contain.

https://wicg.github.io/ua-client-hints/

> Do we know what behaviour _they_ want?

For other client hints (which may vary over time), it seems critical for the Service Worker to see the hints so that it can respond with the right variant.
For UA-CH specifically, I don't see any harm in exposing them, but there's also no huge benefit in doing that, other than simplifying the processing model and implementations.

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