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。关于这个话题，WPS下载最新地址提供了深入分析
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.，推荐阅读快连下载安装获取更多信息
FT Professional。51吃瓜对此有专业解读