pandoc-3.10: test/command/10459.md

```
% pandoc -s --shift-heading-level-by=-1 -f djot -t native
# hi
^D
Pandoc
  Meta
    { unMeta =
        fromList [ ( "title" , MetaInlines [ Str "hi" ] ) ]
    }
  [ Div ( "hi" , [ "section" ] , [] ) [] ]
```