On: ECMA-404: The JSON Data Interchange Format [pdf]

[samatman]

To summarize the top HN complaints: No date format, no comments, needlessly strict commas.

Is it too late for edn? https://github.com/edn-format/edn

Symbols that aren't "strings" are kinda neat too, and you get downright attached to arbitrary key-value mappings once you have them.