发送消息的长度(包括前缀)最长是254个字符。前缀不能包含任何制表符。
The combined length of message plus prefix can be at most 254 characters. The prefix must not contain a TAB character.
许多不同类型的文本文件都包含一系列行，通常具有类似的格式，例如制表符分隔或逗号分隔文件或固定长度的行。
Many different types of text files consist of a series of lines, often with similar formatting, such as TAB - or comma-delimited files or fixed-length lines.
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