Rounding using uncertainty siunitx: uncertainty disppears if bigger than the main value

Question

I am using siunitx in order to display some "mean ± std" of some statistical results, and I use the round-mode=uncertainty option in order to keep the leading order of magnitude of the uncertainty only and match the precision of the mean.

However, if the uncertainty is bigger than the actual value, only a 0 is printed, without the ± sign or uncertainty.

Here is an example:

\documentclass{article}
\usepackage{siunitx}
\sisetup{round-mode=uncertainty,round-precision=1,uncertainty-mode=separate}

\begin{document}

\noindent
\num{10.1 +- 1.0}   \\ % Correct output
\num{0.01 +- 1}     \\ % Prints: 0, should be 0±1
\num{1 +- 10}       \\ % Prints: 0, should be 0±10

\end{document}

Here is a somewhat similar (unanswered) question.

Answer 1

On reflection, it likely would be better to leave the uncertainty showing here for consistency with direct input of e.g. 0 +- 10, then to look for an option to remove uncertainties which are larger than main value. I will address in the next issue-fix release.

---

The current output is by-design, but this could be adjusted by adding an option in this area. For the present, you could use

\cs_gset:Npn \__siunitx_number_round_uncertainty:nnn #1#2#3
  {  \__siunitx_number_round_uncertainty_aux:nnn {#1} {#2} {#3} }

which will bypass the test for sufficient significant digits in the main part.