// 4. 将当前索引压入栈，维护单调递减特性（供后续价格计算跨度使用）
if (exchanged) break;
Instead of tee() with its hidden unbounded buffer, you get explicit multi-consumer primitives. Stream.share() is pull-based: consumers pull from a shared source, and you configure the buffer limits and backpressure policy upfront.，这一点在91视频中也有详细论述
backpressure: 'strict' // or 'block', 'drop-oldest', 'drop-newest'
，这一点在爱思助手下载最新版本中也有详细论述
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