[w3c/ServiceWorker] should FetchEvent.request ever be a range request if we cannot verify if the underlying resource is the same? (#1201)

It seems that in firefox we avoid using partial response and range requests if:

1. The server cannot support range requests
2. The underlying resource has changed since the previous part of the resource was received

See:

https://searchfox.org/mozilla-central/source/netwerk/base/nsIResumableChannel.idl#13

If we allow range requests through FetchEvent.request, how can we ever know if the underlying resource has changed?  Normally we depend on the http cache to detect if a change has taken place, but we don't have that here.  The service worker could return completely different data each time.

Does chrome have similar "detect if something changed" behavior for range requests?

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