A year or so ago, I stumbled upon a website for yet another document language similar to YAML, JSON or XML; it was called https://kdl.dev/. I don't know what became of it, but it had one little feature that stood out: something they called "slashdash comments": /-. You can use it to mark code as comments, but it is scope aware. For example, you can use it to comment out individual keywords and statements like final or implements X: class Foo