packages feed

pandoc-3.10: test/command/11463.md

```
% pandoc -t typst
'hi' and \'
^D
'hi' and \'
```

```
% pandoc -f markdown -t typst | pandoc -f typst -t markdown
"hi" \" 'hi' and \'
^D
"hi" \" 'hi' and \'
```