[NTG-context] dejavu math fallback?

Hi Using math with dejavu as the bodyfont produces: ! Math error: parameter \Umathquad\displaystyle is not set. minimal example: --- \setupbodyfont[dejavu] \starttext $e = mc^2$ \stoptext --- Installing the xits-math (https://github.com/khaledhosny/xits-math/) solves the problem. Shouldn't there be a fallback to lmmath or similar? Log using context without xits-math attached. Adam