I'm excited to see the progress of #709, however one other escape that seems to really be missing is \e (ESC) which is \x1b.

For example, echo -e '\e[31mfoo\e[0m' on an ANSI compatible terminal will print foo in red.

I'm wondering how people here feel about adding this to TOML?

For what it's worth, the maintainers of Alacritty are considering switching from YAML to TOML, and being able to express terminal escape sequences easily would be very nice for us.