// These are analogs of APIs on System.Char
public static double GetNumericValue(Rune value)
{
if (value.IsAscii)
{
uint baseNum = value._value - '0';
return((baseNum <= 9) ? (double)baseNum : -1);
}
else
{
// not an ASCII char; fall back to globalization table
return(CharUnicodeInfo.InternalGetNumericValue(value.Value));
}
}