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.
陈润庭的父亲从这条线索出发，辗转找到了杜耀豪外祖父所属的村庄，并在那里找到了保存完好的族谱。“把杜耀豪一世祖到十八世祖，整个序列都给他查了出来。”陈润庭回忆。
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