JSON5 in dbStatic: Lexer support for NaN and Infinity

The JSON5 spec requires exact capitalization of these strings.
Other numeric parsers such as strtod() are usually more lenient.

modules/database/src/ioc/dbStatic/dbLex.l

@@ -33,10 +33,11 @@ exp         ([eE]{sign}[0-9]+)
 jsonnum     ({int}{frac}?{exp}?)
 intexp      ({int}"."{exp}?)
 fracexp     ({sign}{frac}{exp}?)
+specialnum  ("NaN"|{sign}"Infinity")
 
 zerox       ("0x"|"0X")
 hexint      ({sign}{zerox}{hexdigit}+)
-number      ({jsonnum}|{intexp}|{fracexp}|{hexint})
+number      ({jsonnum}|{intexp}|{fracexp}|{specialnum}|{hexint})
 
 %{
 #undef YY_INPUT