Your three examples in the README.md file help. If you have the time, please add more examples and more example use cases. Sorry to sound lazy, I started reading the code in yayster.el, then stopped, wanting more docs. I wrote an Emacs based coding harness earlier this year, so your ‘opposite direction’ idea is interesting.

Just so you know, your comment was automatically killed for the em dash. HN does this now. I vouched for it.