To me it looks amazing, and I was literally about to adopt it in one of my open source Rust-based projects, but then I realized that the Rust version (and only the Rust version) is restrictively licensed under the Parity Public License [1].

I want my open source project to be able to be used in commercial applications, and don't want any of my dependencies' licenses to restrict that.

[1]: https://github.com/kdl-org/kdl-rs/blob/87f836134c1d901ff5ce6...