How do I change the frame continuation counter from roman numerals (i, ii, iii, ...) to arabics ( 1,2,3, ...)?

I’m trying to find my way through a metropolis-themed template, and I’m kind of lost. I’d love to replace those lowercase roman numerals that appear in multipaged frames with standard arabic numbers.

I have tried to find a solution within the metropolis documentation, and what seems to come close is the following snippet in section 8.3.4 – Frametitle:

setbeamertemplate{frametitle continuation}{%
usebeamerfont{frametitle}
romannumeral insertcontinuationcount
}

The following example reproduces the effect I do NOT wish to achieve, as replacing romannumeral with arabic produces only 0s als subframe counters.

MWE:

documentclass{beamer}
usetheme{metropolis}
begin{document}

% OPTIONAL PART, UNCOMMENT TO ACTIVATE
%setbeamertemplate{frametitle continuation}{%
%usebeamerfont{frametitle}
%arabicinsertcontinuationcount
%}

  section{First Section}
  begin{frame}[allowframebreaks, fragile]{First Frame}
    begin{itemize}
    item Hello, world!
    framebreak
    item Hello, world again!
    end{itemize}
  end{frame}
end{document}

Thanks a lot in advance …

documentclass{beamer}
usetheme{metropolis}
begin{document}

setbeamertemplate{frametitle continuation}{usebeamerfont{frametitle}insertcontinuationcount}

  section{First Section}
  begin{frame}[allowframebreaks, fragile]{First Frame}
    begin{itemize}
    item Hello, world!
    framebreak
    item Hello, world again!
    end{itemize}
  end{frame}
end{document}