Fix unicode character ambiguity

'LATIN SMALL LETTER A' => 'CYRILLIC SMALL LETTER A'
Remove uses of the comma operator
Merge pull request #1908 from yebblies/commaop

Remove uses of the comma operator
Use 4 spaces, not 3 for indentation.
Introduce a cast as a workaround for missing inout constructors.
indexOfAny

indexOfAny unittests

indexOfAny and stuff

lastIndexOfAny unittest

(last)indexOfAny(index) with unittest. docu next

more doc