Thanks Wolfgang!
I wikified your answer, adding a line in «Counters».
I also slightly changed the page layout (replacing code examples with
links to the command pages).
Damien
My MWE:
\startbuffer
\startsection[title={foo}]
\input ward
\stopsection
\startsection[title={bar}]
\input knuth
\stopsection
\stopbuffer
\starttext
\dorecurse{2}{
% how can I reset chapter number?
\setupheadnumber[section][0]
Wolfgang
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