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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第五十九条 就海上货物运输合同所涉及的货物灭失、损坏或者迟延交付通过诉讼、仲裁等方式对承运人提起的任何赔偿请求，无论海事请求人是否为合同的一方，也无论是根据合同或者侵权行为提出请求，均适用本章关于承运人的抗辩理由和限制赔偿责任的规定。
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