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.
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圖像加註文字，黎智英正就國安案被判囚20年，由於欺詐刑期被撤銷，出獄時間有所縮減，但仍要服刑至2040年。原審：黎「刻意隱瞞力高的存在」。搜狗输入法下载对此有专业解读
Trump also said at the time that there would be "no more oil going to Cuba". His administration has blocked shipments from Venezuela and threatened tariffs on other nations delivering oil to the island.。safew官方下载对此有专业解读