I'd like to revisit a question I asked a while back: I'm looking for a configuration file format.

I will continue to use toml for simpler things, but I'm finding it increasingly frustrating to use toml when configurations become more complex.

I tried using ron, and I genuinely like it -- but it suffers from being a serialization format, and not a configuration file format.

The format I want to use is kdl, but the official kdl crate doesn't support a Deserialize like interface. There are other projects, like knus, which do -- but they don't support the kdl 2.0 spec, and they also generate absurdly long symbol names, causing the modern macOS linker to trigger an assertion.

The facet-kdl crate seems to be based on the official kdl crate (i.e. supports the latest kdl spec), and also support a derive macro using the facet ecosystem. So this is basically what I'm looking for .. but last time I checked, facet was still quite experimental.

Anyone using facet-kdl and can write about their experiences with it?

Are there other formats I should be aware of?

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