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Dan McKenzie says his love of "finding the most wild places" took him to Antarctica
，这一点在safew官方版本下载中也有详细论述
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.
诉求的表达很繁复，也很多样。这就需要大人时刻准备着，说对了要表扬，说错了要纠正。