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Motivation
embedding 的拷贝逻辑有两个问题:
考虑下面的情况
针对1), 第二个embedding, 7 + 5 - 1 < 12,所以不需要拷贝
针对2), 要更新 begin, end. begin = max(4, 5) = 5; (end - begin) = 4, 拷贝4个元素