Often the turing completeness comes not from the config _format_ but from the semantics. A good example of this is Logstash config, where your config is an arra

Often the turing completeness comes not from the config _format_ but from the semantics. A good example of this is Logstash config, where your config is an array of steps to apply, each of which can filter things in certain ways based on certain conditions, and before you know it you've used 100 lines to badly and buggily implement a 5-line script in a real language.