@pavel @micr0 I don't think whitespace is the main problem with YAML.

Per Martin Tournolj: "YAML may seem ‘simple’ and ‘obvious’ when glancing at a basic example, but turns out it’s not. The YAML spec is 23,449 words; for comparison, TOML is 3,339 words, JSON is 1,969 words, and XML is 20,603 words." From https://www.arp242.net/yaml-config.html