By this point, fermaw understood that his player instance was being ambushed whenever it called .play(). He tried to isolate the player from the main window context entirely.
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。关于这个话题，夫子提供了深入分析
市民小心翼翼地走在冰面上，冰面上坑坑洼洼净是冰碴儿。
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.，更多细节参见同城约会