Author(s): Chongfeng Zhang, Yi Song, Leiji Li, Xiaopeng Shen, Weijun Wang, Tianchi Zhu, Fei Xiao
(currently 32-byte) slice backing store, and uses that backing store
。关于这个话题，safew官方下载提供了深入分析
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// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4
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