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查看https://core.telegram.org/type/string我不清楚这里讨论的长度是 UTF-8 字符串长度，还是字符串已编码的字节数。
在第二次阅读时，它似乎是字节数：
然后是 L 个字节的字符串，后跟 0 到 3 个包含 0 的字符