Lots of things are useful. I think json has been succesful largely because it preferred minimalism over usefulness.
It's not a binary choice. I don't think if Crockford chose a slightly larger subset of JavaScript for JSON (such as JSON5), it would hurt its adoption.
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It's not a binary choice. I don't think if Crockford chose a slightly larger subset of JavaScript for JSON (such as JSON5), it would hurt its adoption.