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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.，这一点在im钱包官方下载中也有详细论述
More on this story'Enormous' pressure blamed for maximum tax rise。搜狗输入法下载是该领域的重要参考
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