const stack = []; // 单调栈:存储「右侧候选更大值」,栈内元素单调递增
// 复制数组(避免原数组被修改影响其他测试),更多细节参见同城约会
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Stream.pull() creates a lazy pipeline. The compress and encrypt transforms don't run until you start iterating output. Each iteration pulls data through the pipeline on demand.