In the top of file type-pre.tex it can be read: %D This file is obsolete. We now have latin modern and proper %D typescripts. Forget about this file. However, tracing execution of \startformula[bold] shows it is still read then, whereas on \startformula (without the bold) it is not.
Isn't this an anomaly? Just curious (I hope curiosity is permitted in this group).
Hans van der Meer