fancyvrb, helvetica and underscore… is it just me?

Question

Ran into some weirdness with fancyvrb, helvetica and _. Here's a MWE (for me):

\documentclass{article}
\usepackage{fancyvrb}

\begin{document}

\begin{Verbatim}[fontfamily=helvetica]
Oh no! It's a `_'. `\_' not much better.
\end{Verbatim}

\end{document}

Without any warnings or apologies, it produces

...i.e., missing a couple of underscores. Strange thing is, it works fine for fontfamily=courier.

Anyone come across anything like this before?

I'm not commited to fancyvrb so if a work-around is awkward, would happily take suggestions for another helvetica/sans-serif verbatim environment which would handle underscores.

Answer 1

Use the Cork encoding:

\usepackage[T1]{fontenc}

The following

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

\begin{document}

\begin{Verbatim}[fontfamily=helvetica]
Oh no! It's a `_'. `\_' not much better.
\end{Verbatim}

\end{document}

produces the expected result: