Am 04.03.2011 um 15:28 schrieb Hans Hagen:

> On 4-3-2011 2:09, Andreas Harder wrote:
>> Hi all,
>> 
>> I'm (re)tying to draw some attention to the $n\choose k$-issue with OpenType math fonts.
>> 
>> I've made some test files:
>> http://dl.dropbox.com/u/151837/OpenType-Math.7z
>> 
>> The best output is generated by LuaLaTeX (at least for Asana and Cambria). Would it be possible to correct the ConTeXt output as well?
> 
> It depends what correction boils down to. Normally it's the opentype font parameters that control the threshold to the next step in a larger delimiter

This subject is also discussed on the LuaLaTeX mailing list.
http://tug.org/pipermail/lualatex-dev/2011-March/thread.html#1118 

Greeting
	Andreas