@jenniferplusplus AFAIK, it is an IETF JSON thing, and wasn't part of the original (pre-IETF) JSON.Here's the oldest version of the JSON spec I could find:https://web.archive.org/web/20030228034147/http://www.crockford.com/JSON/index.htmlIt defines "number" as in the screen-shot, and doesn't say anything about floating-point numbers....I do agree with you that the reason IETF JSON talked about floating-point numbers is almost certainly because of JavaScript.