Dear list,

I have the following sample:

\startluacode
function document.gouppercase(str)
tex.print(str:upper())
end
\stopluacode

\unexpanded\def\MyUpper#1%
{\ctxlua{document.gouppercase("#1")}}

\starttext
\doif{\MyUpper{adfalkjfaeñf}}{\MyUpper{aDFAlkjfaeñf}}{equal}{unequal}

\ctxlua{if string.upper("adfalkjfaeñf") == string.upper("aDFAlkjfaeñf")
then tex.print("equal") else tex.print("unequal") end}
\stoptext

Why are are the first two strings unequal?