# The siunitx package messes with manually input thousand-separators

Recently I found the very useful siunitx package, and immediately looked to use it for some tables. Unfortunately, I already have all my numbers typeset with , thousand separator and . decimal separator.

If I try something like:

\documentclass{standalone}
\usepackage[group-separator={,}]{siunitx}
\begin{document}
\begin{tabular}{S[table-format=6.2]}
300,000.12\\
\end{tabular}
\end{document}

I get errors like:

Duplicate decimal marker '.' in input.

If I replace 300,000.12 with 300,000 it considers it as the 300.000 (i.e., 300).

This seems strange to me as the package interprets 300000 as 300,000 but it interprets 300,000 as 300.000.

I've scanned through the detailed siunitx documentation, but could not find any flags for picking up input separators. Anyone know how siunitx can be parameterised to treat raw input numbers like 300,000.12 gracefully?

(I would rather not remove all commas from all input numbers.)