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.
// console.log(canSeePersonsCount([5,1,2,3,10])); // 输出 [4,1,1,1,0]（正确），这一点在服务器推荐中也有详细论述
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to call CICS the first "enterprise customer relationship management system,"