// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
The spec does not mandate buffer limits for tee(). And to be fair, the spec allows implementations to implement the actual internal mechanisms for tee()and other APIs in any way they see fit so long as the observable normative requirements of the specification are met. But if an implementation chooses to implement tee() in the specific way described by the streams specification, then tee() will come with a built-in memory management issue that is difficult to work around.
，这一点在服务器推荐中也有详细论述
for t := range c {
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