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If you restrict your language to pure functions only, then it is quite possible to have a system be both declarative and reproducible while having more expressivity than yaml.

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and indeed, this is the approach that config-centric languages like Nickel[0] take.

[0]: https://nickel-lang.org/

The priority field in Nickel seems a lot like CSS weighting, though more explicit, I suspect it will cause headaches at scale.

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