Hi,
\def\tsvar#key#default% undocumented and unofficial
{\expandafter\ifx\csname\??ts#key\endcsname\empty
\csname\??ts#key\endcsname
\else
#default%
\fi}
has to be (#default in the empty branch)
\def\tsvar#key#default% undocumented and unofficial
{\expandafter\ifx\csname\??ts#key\endcsname\empty
#default%
\else
\csname\??ts#key\endcsname
\fi}
Wolfgang
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