[magicalhippo]

We've used XML for interchange of order-like data. Customers have started demanding JSON, so I built a tool to generate XML <-> JSON converters, along with JSON Schema file, based on an XSD, so we could continue to use our existing XML infrastructure on the inside.

I must admit I totally forgot about the JSON number issue. Our files include fields for various monetary amounts and similar, and in XML we just used "xs:decimal".

Most will be less than a million and requires less than four decimal digits. But I guess someone might decide to use it for the equivalent of a space station or similar, ya never know...