On Fri, Apr 17, 2015 at 05:07:31PM +0200, Frédéric Wang wrote:
> Hi all,
> 
> Here is a testcase with a dev version of GNUFreeFont:
> http://fred-wang.github.io/MathFonts/GNUFreeFont/
> 
> As I understand, stretchy U+2F/U+2211/U+27E8/U+27E9 do not have a "glue"
> so we connect them using a rule

AFAIK, The only times TeX (and by extension OpenType math implemenation)
use rules is for radical and fraction bars, everything else is done
using glyph variants and/or repeatable parts. If the font does not
provide the required glyphs no stretching happens.

Regards,
Khaled

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