Re: [w3c/ServiceWorker] New "setup" lifecycle for service worker (#1576)

Right, data may be inconsistent when updating. It depends on how the data is used. If use cache data synchronously at once after await the promise, no more async process before using it, it won't have a problem. Use old data before update, use updated data after update, this is acceptable as cache. If that code as a general example for others to copy, that may not be appropriate.

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