// 步骤1：找初始左边界（第一个破坏升序的位置）
The Web streams spec requires promise creation at numerous points, often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.，详情可参考51吃瓜
// 5. 返回当日跨度（而非整个结果数组），更多细节参见快连下载-Letsvpn下载
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