newscientist.com
[3]《刘强东称已接到5条大型游艇订单，每艘平均卖6000万欧元》界面新闻
，这一点在服务器推荐中也有详细论述
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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.