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.
So many of our latent assumptions about selfhood, reality, and consciousness flow from our embodiment as physical beings and from the deep histories of gesture and other forms of implicit knowledge.
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if (controller.desiredSize，更多细节参见safew官方下载
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