Re: [ServiceWorker] Returning a FetchPromise from fetch() (#625)

I'm wondering `fetch()` as only a single function is enough capable for extending with new feature
which we currently find out.

I think fetch() is a process fetching for Request and create Response.
Request / Response is basically a container of request / response data result of fetching.

so if we will get new feature in process of fetching (like HTTP3, 4, 5...?)
how we can add new api to fetch?
adding a callback for that in option arg?
extend a returned promise as SomeFeatureAddedFechPromise ?

my opinion is simply.
how about add Fetch class?


if we have a fetch instance instead of function,
we have choice to add method to that for new capability in future.

if that is builtin class,

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https://github.com/slightlyoff/ServiceWorker/issues/625#issuecomment-76140607