I spotted a strange behavior when I use \setupformulas[way=bychapter,prefixsegments=chapter] to get formula numbers with the chapternumber as prefix and using \setuphead[…][number=no] to turn off the title number.
\setupformulas[way=bychapter,prefixsegments=chapter]
\setuphead[section][number=no]
\starttext
\chapter{foo}
\placeformula
\startformula
E=mc^2
\stopformula
\section{bar}
\placeformula
\startformula
a^2+b^2=c^2
\stopformula
\stoptext
The second formula has only the formula number 2. I would expect the formula number 1.2 (or at least I would want to get this number).
Thanks for help
Jannik