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.
СюжетАтака БПЛА
，这一点在搜狗输入法2026中也有详细论述
One Saturday, a 16-year-old hauled a heavy, three-foot tube into the middle of a large field in Wisconsin.
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08
At least 15 people have been killed and others injured after a Bolivian air force cargo plane crashed in the western city of El Alto, the country's authorities say.