Re: [ServiceWorker] Can caches store and retrieve results that are still being written to the cache? (#573)

```
var imgRequest;
```

If we're advising people not to use global script vars in SW normally, it seems like this might be confusing for devs.

Is this an argument to add a cache method to "match() and add() only if not present"?

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https://github.com/slightlyoff/ServiceWorker/issues/573#issuecomment-66487730