## Function: SB-UNICODE:DECIMAL-VALUE
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> Returns the decimal digit value associated with CHARACTER or NIL if
> there is no such value.
> 
> The only characters in Unicode with a decimal digit value are those
> that are part of a range of characters that encode the digits 0-9.
> Because of this, `(decimal-digit c) <=> (digit-char-p c 10)` in
> #+sb-unicode builds

### Lambda list
```cl
(character)
```