I see the author is here — I wonder if you also handle PDFs? Quick look at the site indicates that yes, but could you tell more about it? Do you also have a custom parser/serializer? Do you allow for PDF editing?

The reason for asking, is that I've had a shower thought of building custom PDF/doc reader for myself, that would allow me to easily take notes and integrate with Anki. Been doing that in Obsidian with the pdf plugin, but it's too slow. At the same time, I've heard that PDF spec is not easy to work with, so I'm curious about your experience on that front.