\input regression-test.tex
\documentclass{article}
\usepackage{osgstyler}

\DeclareOsgListPalette{fancy}{
  itemize = {
    1 = {label=\textbullet},
    2 = {label=\textendash}
  },
  enumerate = {
    1 = {label=\arabic*)}
  }
}

\begin{document}
\START
\UseOsgListPalette{fancy}
\ExplSyntaxOn
\TYPE{itemize-1-stored=\prop_item:Nn \g__osgstyler_list_palette_prop { fancy/itemize/1 }}
\TYPE{itemize-2-stored=\prop_item:Nn \g__osgstyler_list_palette_prop { fancy/itemize/2 }}
\TYPE{enumerate-1-stored=\prop_item:Nn \g__osgstyler_list_palette_prop { fancy/enumerate/1 }}
\ExplSyntaxOff
\begin{itemize}
  \item one
  \begin{itemize}
    \item nested
  \end{itemize}
\end{itemize}
\begin{enumerate}
  \item first
  \item second
\end{enumerate}
\TYPE{done}
\END
\end{document}