//echo -a > $instok(a,b,-1,) -- $instok(,b,-1,)
When omitting the 'ascii' number parameter, when the input text is different from $null, $instok returns $null, it doesn't if the input text is $null, which is surprising to me.
Not sure what should be the correct behavior and I know token $identifiers were changed 'recently' to fix some discrepancies so maybe this can't be fixed.
Ideally I'd like to be able to omit the C parameter in all case, mIRC uses 0 in this case, which is handy to stick character together (while you need the features/behaviors provided by $instok), so ideally $instok(a,b,-1,) should be "ab"
