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.
Davidson later told Variety he had felt a "wave of shame and embarrassment" afterwards. "The most offensive word that I ticked at the ceremony, for example, is a word I would never use and would completely condemn if I did not have Tourette's."
，这一点在搜狗输入法下载中也有详细论述
Credit: Keeprix
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