RE: forbiddenCharacters data category - related to [ACTIOn-189]

Hi Arle,

> I would add one bit of text:
> Note: Because the contents of this category specify forbidden 
> characters, implementers need to pay special attention when 
> converting ranges that specify allowed characters to ensure 
> that they select ranges appropriately.

Sound sensible.
I'll do that for the next round, once Felix is done with the draft prep.

-ys