Cmarker: How to avoid duplicate attribution when nesting quotes?

[flokl]

This sets all attributions inside the outermost quote to none.

#import "@preview/cmarker:0.1.8"
#cmarker.render("
<!--raw-typst #set quote(attribution:\"bob\") -->
<!--raw-typst 
#show quote: it => {
  set quote(attribution: none)
  it
}
-->
> Hello,
> > world!
> I
> > am
> writing
> > > a
> > > sentence
")