Numeric Characters (ANSI and GNU Common Lisp Document)

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#### 13.1.4.8 Numeric Characters

The numeric characters are a subset of the graphic characters. Of the standard characters, only these are numeric characters:

`0 1 2 3 4 5 6 7 8 9`

For each implementation-defined graphic character that has no case, the implementation must define whether or not it is a numeric character.