[NTG-context] $n\choose k$-issue with OpenType math fonts

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? Regards Andreas