You've made my point with "If you need greater precision or fixed decimals, use a base10 string and an appropriate library in your application". In other words, it's not interoperable or type safe. BTW the JSON spec itself doesn't define integers at all. "Numbers are really floats" comes from Javascript and hence is just a convention for people who are using JSON from another language.

The larger problem is the lack of schemas. In JSON they exist but no one uses them. CORBA forced you to have a schema (IDL). SOAP had schemas, albeit very complex ones which no one really understood.