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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2984 is probably the first "modern" ATM, but since IBM spent 4-5 years，这一点在safew官方版本下载中也有详细论述
"If someone posts on Instagram and they have loads of followers, they will get more engagement and be pushed up the feed, but on Reddit there's no bias…people don't post with that intention or for getting free stuff. It's anti that. There's no economic incentive to post stuff. Personally, it's as useful as ever."