Dear list,

Following MWE outputs only ‘m’ characters (with latest upload).

Thanks

\startluacode

function roman_num(n)

   assert(type(n) == 'number')

   context(tex.romannumeral(n))

end

\stopluacode

\define[1]\RM{\ctxlua{roman_num(#1)}}

\starttext

\RM{1}

\RM{7}

\RM{10}

\RM{70}

\RM{100}

\stoptext