I mean there is only so many ways of representing a data structurally clearly. I find that yaml is good enough but like XML leads to a lot of bloat, but unlike XML isn't nearly as complicated. I'm not sure making it a library resolves the issue better than creating a custom grammar that appropriately accommodates what people want to express in the language easily, make the possible and desired easy, the impossible and undesirable states hard if not unrepresentable. I mean having a custom language does allow for loops, and functions which isn't something I find I need too much in CI. Perhaps templating / functions but having a full Turing complete language leads the way for bad states / nonideal uses.