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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.
。搜狗输入法2026对此有专业解读
（四）调阅、复制与监督事项有关的资料；
（一）故意干扰无线电业务正常进行的；