Thanks for posting this. Great stuff!
> On a page that loads 100 images four at a time, you would want 4 cleanup > actions registered, not 100. > And in order to keep it to 4 you need a way to unregister the action when you complete the operation, which the promise API doesn't give you. I see. Conceptually, you could of course set some "complete" flag when you finish the operation and then have the cleanup action early-exit if that flag is set, but that would be unwieldy. And it wouldn't stop the unbounded growth of the promise's handler list. Interesting!
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