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> really what I want is JSON with comments and multiline strings for the "human reader/writer" use case

Sounds like you want json5: https://json5.org/

It also has the "Arrays may have a single trailing comma." feature which is a pain to not have in json.

Oh yeah, I forgot to include the trailing comma in my list of wants. But yes, I probably want something like json5, albeit it would be nice if it had the traction that YAML and company enjoy. One problem with most of these JSON++ dialects is that they tack on a bunch of low-value features like single-quoted strings and unqouted keys that complicate building parsers and facilitate stylistic differences.

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