Why does siunitx remove the space after \percent?

Question

When using siunitx to write percentages, I run into a problem with missing spaces. Why does that happen? And what would be the best practice for writing percentages in text?

\documentclass{article}

\usepackage{siunitx}

\begin{document}

Siunix will eat the space after \SI{100}\percent as you can see here.
Using 0 \% of siunitx the space is there.

\end{document}

Answer 1

If you use it a \SI{100}{\percent} as then things work just fine:

Using {} to delimit parameters is the preferred LaTeX method.

Code:

\documentclass{article}

\usepackage{siunitx}

\begin{document}

\verb|Siunitx| will eat the space after \SI{100}{\percent} as you can see here.
Using 0 \% of \verb|siunitx| the space is there.

\end{document}