记住这个「条件对应法则」，同类题都能快速确定弹出条件，不会写反。
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。快连下载-Letsvpn下载对此有专业解读
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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.