Use Unicode character properties
使用 Unicode 字符属性
Character properties are information needed to understand and use a character.
字符属性是理解并使用字符所必需的信息。
Some character properties are independent of the context in which the character is used, for example, whether or not a character is customarily used as a numerical digit.
有些字符属性与使用字符的上下文无关，例如，某一字符是否被作为数字使用就与上下文无关。
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