Hi all,

please consider this artificial but valid LaTeX code:

--8<---------------cut here---------------start------------->8---
\documentclass{article}

\usepackage{siunitx}

\begin{document}

\numlist[list-separator={[ }]{0.1;0.2;0.3}

Some text here

\numlist[list-separator={] }]{0.1;0.2;0.3}

\numlist[list-separator={; }]{0.1;0.2;0.3}

\end{document}

%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End:
--8<---------------cut here---------------end--------------->8---

which looks like this with emacs -Q and vanilla AUCTeX: