As someone who doesn't know a whole lot about fonts, but who is interested in a decent font being made open source, I would never think to look in the "hinted" directory.
Out of interest, why is it called "hinted" and not "example" or something? I'm guessing it's font lingo?
Basically for fonts to look good when placed on a square grid (pixels) there is a method called hinting which as the name implies gives hints to the font renderer on how the fonts should be drawn across this grid in order to best preserve the intended look of the font and be readable, this has the greatest impact when you are using a very limited size grid such as in small font sizes.
As someone who has ADD: yes, font lingo. It has to do with render alignment and the fact that pixels aren't round. It is amazing the level of complexity underlying font rendering, look at the internals for lcd filter weights some time.
https://github.com/google/roboto