Re: [w3c/ServiceWorker] Clarification on what happens during a terminated activation (#1372)

I agree with @wanderview -- the isue is the unexpected partial state.

For a concrete example, let's consider the Workbox precaching activation flow.

During installation, the assets are downloaded into a 'temp' cache.

During activation, the assets are transferred from the 'temp' cache into the 'active' cache.

A workbox service worker only serves assets from the 'active' cache.

If activation does not fully complete, but we move the worker into the active slot, some assets will be un-servable from the 'active' cache, because they did not complete moving from the 'temp' cache.

It would mean that all 'activate' handlers need to be built in a way that is compatible with a partial, non-deterministic completion point.  This is possible, but needs to be clearly documented in the spec

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