[NTG-context] Iwona Heavy and Math

Hi, I am simply trying out different math fonts available, and found iwona-heavy to be "strange". Look at the output of \usetypescript [iwona-heavy][ec] \setupbodyfont[iwona-heavy,ss,11pt] \starttext This is some test \startformula \Pr(A = B) = \frac 12 \stopformula \stoptext The math is much bolder than the text. Is this by design? Aditya