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The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
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await scene.play(new FadeOut(square));
In total there are 10 separate investigations – or modules as they are called. So far only two, looking at pandemic preparedness and government decision-making, have been completed.