As a similar, yet more powerful data format I started using Nickel (https://nickel-lang.org). It has very sophisticated typing and transformation features. Highly recommended!
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rec files are not configuration, they are just a very simple and basic way of representing tabular data, very similar to a CSV. But it uses lines to separate columns and records, making it much simpler to add and edit records by hand, differently from CSV
recutils is aimed at database rather than config use-cases