首先，它可以从面向字节的代码集编码单字节字符，其次，当在数组中使用时，它可以从多字节字符集(如unicode)，编码任何多字节字符。

First, it can encode a single byte character from any byte-oriented code set, and second, when used in an array, it can encode any multi-byte character from a multi-byte character set such as Unicode.

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