{Case changing: \LaTeX\ reaches Unicode-land}
{Joseph Wright}
{In 2015, I talked about my work exploring Unicode-land, particularly
how to carry out case changing in \XeTeX\ and \LuaTeX\ properly. Since
then, \texttt{expl3} has become a part of the \LaTeX\ kernel, and LaTeX
has adopted \tbUTF-8 as the standard input encoding. The time has
therefore become ripe to ``open up'' Unicode-land to allow
\cs{MakeUppercase} and \cs{MakeLowercase} to roam free.

In this talk, I'll remind us of what Unicode tells us about case
changing, where the challenges are and how we've approached them in
\texttt{expl3}. I'll then show how this has combined with some \eTeX\
features to enable us to make the switch, incorporate ideas from the
\texttt{textcase} package and upgrade \cs{MakeUppercase} and
\cs{MakeLowercase} for the 21st century.}