tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
Dify 自托管本身不按调用收费
，这一点在51吃瓜中也有详细论述
confusables.txt and NFKC disagree on 31 characters，更多细节参见夫子
// 将当前元素的「下一个更大值」存入Map。搜狗输入法2026是该领域的重要参考
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