were optional on the 2984, like a deposit slot, were apparently standard on 3614.
// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）
，这一点在Line官方版本下载中也有详细论述
Author(s): Ming Yuan, Jianqiu Zhou, Jiaxin Cui, Changqing Miao
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