it depends on the application. For things like build systems, ci systems, infrastructure as code, and even things like reverse proxies and webservers, the confi

it depends on the application. For things like build systems, ci systems, infrastructure as code, and even things like reverse proxies and webservers, the config definitely DOES tell the program what to do. And in those cases I think a full programming language makes more sense. For programs like say, a word processor, where the config really is just the environment, and is suffiently simple, something like yaml is sufficient. but please use a format that supports comments if it will be read or written by humans.