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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What is SEMrush?
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if (right - left <= 1) return; // 只有一个元素，无需排序
Tilly's mother, Jenny said her family felt like they had been left without support。51吃瓜对此有专业解读