Александра Лисица (Редактор отдела «Забота о себе»)
// 易错点3：处理最终结果为空的场景（比如num="10"，k=2）
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const result = new Uint8Array(arrays.reduce((n, a) = n + a.length, 0));
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.