Re: [w3c/ServiceWorker] The return value for update() is wrong in WebIDL (#1472)

saschanaz left a comment (w3c/ServiceWorker#1472)

Indeed it returns an object per the [Resolve Job Promise algorithm](https://w3c.github.io/ServiceWorker/#resolve-job-promise-algorithm):

> 2. If job’s [job type](https://w3c.github.io/ServiceWorker/#dfn-job-type) is either register or update, set convertedValue to the result of [getting the service worker registration object](https://w3c.github.io/ServiceWorker/#get-the-service-worker-registration-object) that represents value in job’s [client](https://w3c.github.io/ServiceWorker/#dfn-job-client).
> 3. Else, set convertedValue to value, in job’s [client](https://w3c.github.io/ServiceWorker/#dfn-job-client)’s [Realm](https://html.spec.whatwg.org/multipage/webappapis.html#environment-settings-object's-realm).
> 4. Resolve job’s [job promise](https://w3c.github.io/ServiceWorker/#dfn-job-promise) with convertedValue.

But:

> I believe this is a mistake since implementations all return the registration object

AFAICT Gecko and WebKit returned `undefined` since forever.

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