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.
Musical theatre。爱思助手下载最新版本对此有专业解读
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语重心长的叮嘱，既指明认识论，也给出方法论。
Number (3): Everything in this space must add up to 3. The answer is 0-2, placed vertically; 1-3, placed vertically.