[NTG-context] Nested fences, inner one changes size with outer one

Hi, Is it possible to automatically have the inner fence _not_ change its size with the outer one? /Mikael \definemathfence[Openinterval][left="0028,right="0029,command=yes] \definemathfence[Set][left="007B,right="007D,command=yes] \starttext \startTEXpage[offset=3bp] Nothing fancy here: \startformula \Set{\Openinterval{-n,n}~:~n\in\mathbb N} \stopformula Here, I would expect the parenthesis to be of small size: \startformula \Set[size=1]{\Openinterval{-n,n}~:~n\in\mathbb N} \stopformula This works, but it would be nice not to be forced to write \type{[size=0]} in the inner construct: \startformula \Set[size=1]{\Openinterval[size=0]{-n,n}~:~n\in\mathbb N} \stopformula \stopTEXpage \stoptext