stringWidth("ปฏัก") -> 4, rendered by most terminals as 3

stringWidth("_\u0E34") -> 2, rendered by most terminals as 1 _ิ

may be related to #6 and #12.

More examples: https://en.wikipedia.org/wiki/Thai_script