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.
Author(s): Ziheng Wang, Jinchen Cao, Xiaojian Wang, Wenbo Gu，更多细节参见51吃瓜
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Early physical attractiveness predicts a more socially effective personality in adulthood. Early physical appearance may serve as a slight but consistent predictor of how well a person navigates social situations later in life.，这一点在WPS下载最新地址中也有详细论述
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