I don't care about the RFC TBH, I care about what I can use in a practical use-case to transfer data internally in an optimal way. The json parser at json.org

I don't care about the RFC TBH, I care about what I can use in a practical use-case to transfer data internally in an optimal way. The json parser at json.org parses non quoted keys just fine, since it uses eval(). {1:"bar"} would obviously create a property "1", and {::"bar"} would obviously not be valid.