ConTeXt: Line numbering with background

Question

I'm not sure how to combine line numbering with a background in a typing environment.

Here's what I'm trying to achieve:

Here's a minimal example of what I'm trying:

\starttext
\startbackground[frame=on,background=off]
  \startlinenumbering
    \starttyping
Phasellus neque orci, porta a, aliquet quis, semper a, massa.
Etiam laoreet quam sed arcu.
In id erat non orci commodo lobortis.
    \stoptyping
  \stoplinenumbering
\stopbackground
\stoptext

When I compile this, I get typing in a background, but no line numbers:

However, if I remove the background from the block line numbers appear as expected.

I can get essentially what I want with the framedtext environment but then I can't break across pages:

\starttext
\startframedtext[frame=on,background=off,width={\hsize},frameoffset=2em]
  \startlinenumbering
    \starttyping
Phasellus neque orci, porta a, aliquet quis, semper a, massa.
Etiam laoreet quam sed arcu.
In id erat non orci commodo lobortis.
    \stoptyping
  \stoplinenumbering
\stopframedtext
\stoptext

I can also get line numbers to show up if I wrap the text in a textbackground, but then I'm not able to get the background to extend around the line numbers:

\starttext
\definetextbackground
  [MyBackground]
  [framecolor=black,
   location=always,
   background=off]
\starttextbackground[MyBackground]
  \startlinenumbering
    \starttyping
Phasellus neque orci, porta a, aliquet quis, semper a, massa.
Etiam laoreet quam sed arcu.
In id erat non orci commodo lobortis.
    \stoptyping
  \stoplinenumbering
\stoptextbackground
\stoptext

Is there any way to achieve the result in the first image such that the typing can break across pages?

Answer 1

Just for the record, the following works:

\starttext
\setuplinenumbering[location=text]
\definetextbackground
  [MyBackground]
  [framecolor=black,
   location=always,
   background=off]
\startMyBackground
\startlinenumbering
%For testing only
\dorecurse{2}{\typefile{\jobname.tex}}
\stoplinenumbering
\stopMyBackground
\stoptext

Answer 2

I've done some additional digging through manuals and examples and I found a solution using MetaPost. This provides a lot of flexibility at the cost of being more difficult to understand.

\startuseMPgraphic{MyMPBackground}
  begingroup; save lftbdry, rtbdry, parframe;
  for i=1 upto nofmultipars :
      path lftbdry, rtbdry, parframe;
      rtbdry := rightboundary multipars[i];
      lftbdry := (leftboundary multipars[i])
        shifted (-36pt, 0);
      parframe := point 0 of lftbdry
                --point 1 of lftbdry
                --point 0 of rtbdry
                --point 1 of rtbdry
                --cycle;
      draw parframe;
  endfor;
  endgroup;
\stopuseMPgraphic
\starttext
\definetextbackground
  [MyBackground]
  [location=paragraph,
    mp=MyMPBackground,
    frame=off]
\startlinenumbering
  \starttextbackground[MyBackground]
    \typefile[option=context]{\jobname.mkiv}
  \stoptextbackground
\stoplinenumbering
\stoptext