[XeTeX] fontspec and languages

[Khaled Hosny]

On Wed, Sep 11, 2013 at 05:47:34PM +0200, Javier Bezos wrote:
> 
> >Last time I heard from him on this, it was something in the lines of “I
> >wish I didn’t implement \addfontfeatures”, say I maintain my position
> >that people should avoid it whenever possible, it is just a hack.
> 
> And the alternative is...?

Nothing. It is a feature that have to be implemented by the engine
(should be easy with some Lua hackery, not so much in XeTeX).
\addfontfeatures right now simply defines a new LaTeX font based on the
active one, and appends the new feature, which is neither efficient nor
robust (and works only with fontspec loaded fonts).

Regards,
Khaled