Fun fact: part of why TOML 1.1 has taken so long to land is because of open questions around unicode key normalization. That in itself sounds dry and boring, but the discussion threads are anything but.

https://github.com/toml-lang/toml/issues/994

https://github.com/toml-lang/toml/issues/966

https://github.com/toml-lang/toml/issues/989

https://github.com/toml-lang/toml/pull/979