packages feed

pandoc-3.10: test/command/9585.md

```
% pandoc -f native -t typst
[ Header 2 ( "" , [] , [] ) [ Str "One" ]
, Header 2 ( "" , [ "unnumbered", "unlisted" ] , [] ) [ Str "Two" ]
, Header 2 ( "" , [] , [] ) [ Str "Three" ]
]
^D
== One
#heading(level: 2, outlined: false, numbering: none)[Two]
== Three
```