TOML is great if you think of it as JSON, but optimized for being written by humans instead of machines. I hope no new first-class types or syntax features ever get added after the 1.0 release so it can have the same stability that makes JSON great. The vast majority of the proposals that I see in the repo's issues would collectively destroy the value of TOML, and I'm glad the current maintainer seems to have the sense and fortitude to resist such additions.