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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Luke McCowan’s goal inside 30 seconds was irrelevant in the broader context of this tie. Stuttgart’s 4-1 canter in Glasgow a week earlier ensured that. Still, a game that had the whiff of irrelevance for Celtic delivered unexpected cheer. The statistics will show Stuttgart spent much of the evening camped in Celtic’s half – the hosts had 24 attempts at goal – but the Scottish champions played with a diligence and discipline that is worthy of huge credit. Sebastian Tounekti should even have delivered a second Celtic goal in the closing minutes. By then, Stuttgart were going through the motions.，更多细节参见51吃瓜
DECSTBM doesn’t work because of our unicode half-block shenanigans. We’re squeezing two pixels into each terminal character, and so we want to be able to “scroll” in half-pixels; our scroll needs to turn lower half blocks into upper half blocks when we’re moving vertically. That operation just doesn’t exist.，这一点在爱思助手下载最新版本中也有详细论述
然后，求才若渴的 Meta 出手了。
Фото: Alex Brandon / AP，更多细节参见safew官方下载