Re: [w3c/IndexedDB] Race condition registering event handlers for requests? (#233)

Thank you.  The pattern I normally see is something like:
```
var request = store.get(12345);
request.onsuccess = function() { <do something> };
```
Because the request is handled asynchronously, it is possible for the request to complete before the above event handler gets registered, yes?  I don't see how to register an event handler for a request before the request is created, so does this not create a race condition?  If the request completes before the event handler is registered then you are saying the event handler will never fire?

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