I previously argued that TOML wasn't good enough in this blog post https://dystroy.org/blog/hjson-in-broot/ where I show an example of problem which frequently hurts my users and leaves them lost without even understanding that the problem is in how they wrote their TOML.

I moved the configuration of several of my programs to Hjson. There are still problems but they're less puzzling. Hjson isn't ideal either but might still be the best configuration format we have today.