Trailing zeros with angle-mode = arc

[schtandard]

\documentclass{article}

\usepackage{siunitx}

\begin{document}

\ang[angle-mode = arc]{1}

\end{document}

gives 1°0'0" though I would have expected 1° (as both fill-angle-minutes and fill-angle-seconds are off as standard).

[josephwright]

The fill-angle-... options were aimed at the arc input format: I guess here at present the behaviour is simply undefined. I'll put this on the 'to thing about' list.