[HarfBuzz] Choosing "dev2" vs "deva" OT script for shaping

[Martin Hosken]

Dear Behdad,

> I can extend the BCP 47 extension to also choose the script system if it's
> available.  Eg, a language setting of "x-hbotdeva" will choose "deva" whereas
> "x-hbotdev2" will choose "dev2".  This works for script tags that have four
> letters (ie, not 'lao ', 'yi  ', 'nko ', and 'vai ').
> 
> We would only recognize the three-letter ones as language system tag.
> 
> This will be useful for choosing 'math' script as well.

+1

Or you could use x-hbscdev2 (as in script) to separate the namespaces.

Yours,
Martin