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.
Медведев вышел в финал турнира в Дубае17:59
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With original dialogue in Turkish, this shuffling of potential partners in a sequence of meaningless encounters ranks with the finest auteur movies
"Boys like either dinosaurs or airplanes," he said. "I was very much an airplane boy."