Re: [w3c/ServiceWorker] Consider throwing when non-promise is passed to `waitUntil`. (#1068)

It seems a bit breaking to suddenly require an exact resolution type for install event `waitUntil()`.  This API has been in the wild for a long time and it seems likely people do resolve to other values.

The browser could detect if it resolves to a function, though, and add a console warning that perhaps the function was not called?

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