Comment by CBLT

> TOML isn't great for hierarchical data.

My experience is different: TOML isn't obvious if there's an array that's far from the leaf data. Maybe that's what you experienced with the hierarchical data?

In my usage of it (where we use base and override config layers), arrays are the enemy. Overrides can only delete the array, not merge data in. TOML merely makes this code smell more smelly, so it's perfect for us.