And \ListSort[[abc]]{value} turns out to be worse: doesn't makes it into LuaTeX at all.
dr. Hans van der Meer


> On 5 Sep 2021, at 10:14, Hans van der Meer via ntg-context <ntg-context@ntg.nl> wrote:
> 
> There is something I do not understand in the passing of parameters from TeX to LuaTex.
> This is my TeX definition:
> \def\ListSort[#1]#2{\directlua{hvdm.listsort([===[#2]===],[===[#1]===])}}
> 
> Calling \ListSort[sep={ + }]{} delivers the string  'sep={ + }' into LuaTeX as the printout in the logfile shows and as intended.
> However in \ListSort[{ + }]{} the braces have disappeared and transferred is nothing more than ' + '.
> 
> Why is the transfer messing up the character string I am passing by removing the outer braces? Is this a bug or is it an unavoidable consequence of the TeX-LuaTeX interface?
> 
> dr. Hans van der Meer
> 
> 
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