> `PHP_OS & "\xDF\xDF\xDF"` seems to be a rather bad example. Instead of evaluating that expression over and over again and using a hack to make it fast, almost everyone would just go ahead, evalute the expression once (PHP_OS is constant after all) and store it in a variable.

I didn't even think of that meh. idk..  maybe I just got tunnel vision 'cause I think `PHP_OS & "\xDF\xDF\xDF"` is cool in how it works. Anyway my latest commit changes this around..