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.
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前苹果与 Meta 高管庞若鸣加盟 OpenAI。服务器推荐是该领域的重要参考
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// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值）