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.
// 步骤4：扩展左边界（向左找所有minVal的元素，全程不越界），推荐阅读im钱包官方下载获取更多信息
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