l3coffins — Wrong width if the coffin contents is a list

Question

In the example below you see that the coffin with the input enumerate has the wrong with. I can fix this by using \@parboxrestore.

1. Is there an expl3-solution?
2. Should this solution be the default for coffins?

\documentclass{article}
\usepackage{xcolor}
\usepackage{kantlipsum}
\begin{document} 
\ExplSyntaxOn
\coffin_new:N \l_xframed_store_one_coffin 

\NewDocumentEnvironment { xframed } { }
 {
  \vcoffin_set:Nnw \l_xframed_store_one_coffin { .7\linewidth }
 }
 {
  \vcoffin_set_end:
  \fboxsep0pt\fbox{\coffin_display_handles:Nn \l_xframed_store_one_coffin { red }}
}
\ExplSyntaxOff

\begin{xframed}
\kant[2]
\end{xframed}


\begin{xframed}
\begin{enumerate}
\item foo
\item bar \verb+1+
\end{enumerate}
\end{xframed}

\makeatletter
\begin{xframed}
\@parboxrestore
\begin{enumerate}
\item foo
\item bar \verb+1+
\end{enumerate}
\end{xframed}

\end{document}

Answer 1

The fix does not actually need all of \@parboxreset: a simple

\linewidth\hsize

will do it. Probably we need to alter this in l3coffins as unless the LaTeX3 l3galley module is loaded then there is nothing to alter \linewidth in the coffin code.