[NTG-context] 9pt with \setupbodyfont[10pt,rm]: bug or feature?

Hi, I have discoverered some inconsistent behaviour: This is OK: \usetypescript[modern][ec] \setupbodyfont[11pt,rm] % also 12, 14, 8pt, ..., but not 10pt! \starttext \aacute---\switchtobodyfont[9pt]\aacute \stoptext This is also OK: \usetypescript[modern][ec] \setupbodyfont[modern,10pt,rm] \starttext \aacute---\switchtobodyfont[9pt]\aacute \stoptext But this is wrong \usetypescript[modern][ec] \setupbodyfont[10pt,rm] \starttext \aacute---\switchtobodyfont[9pt]\aacute \stoptext Why? Vit