NSRangeExceptions with en_US on some(?) apostrophes

CODE REGION:

      if (loc < wordLength) {
            [result appendString:
             [token substringWithRange:NSMakeRange(loc, wordLength - loc)]];
        }

SAMPLES:

[61344:207] going to append token "hadn’t" with loc 3 and len 5

[61363:207] going to append token "we’ve" with loc 0 and len 7

[61377:207] going to append token "Let’s" with loc 0 and len 7

[61394:207] going to append token "They’re" with loc 0 and len 9

Previous commit does not have this problem.