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.
Concept art for the project.
，详情可参考搜狗输入法2026
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“빚 좋은 개살구”…고소영, 결국 눈물 터졌다