[NTG-context] Strange numberconversion in appendix

Hello, I find this behavior a little odd: \starttext \startbodymatter \startplacefigure[reference=mill,title={A mill}] \externalfigure[mill] \stopplacefigure \startplacefigure[reference=cow,title={A cow}] \externalfigure[cow] \stopplacefigure \stopbodymatter \startappendices In \in{figure}[cow] on page \at[cow] is a cow. \stopappendices \stoptext The figure number is converted into roman numerals (Romannumerals). How can I change it to normal numbers? So that it says "figure 2". It should also be considered to make it the default setting.