alt Hacker News> It's very error prone to describe a hierarchy of versioned software packages and configuration with shell scripts and yaml.
We have a multitude of configuration/markup languages all doing the exact same thing.
We have solved this problem in the 60s: S-Expressions. Should have just used that for everything. Configuration, code, websites, you name it. Infinitely extendable, easy to parse.
I'm a lisp nerd, but why do you say sexps are the answer here? I think the point of a lot of configuration formats is that they don't want their configuration to also be a full-fledged programming language.