Typo, avoid ligature in long option name

[muzimuzhi]

Somehow lmodern package enables the "--" (double-hyphen) to en-dash ligature for \ttfamily, in T1 encoding. The result looks wrong for long CLI options.

No similar cases are found in l3build.dtx.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}

\begin{document}
\verb|--option|

\texttt{--option}
\end{document}

In l3build.pdf, page 4