Keep the rules for requesting and sending representations of numbers. Allow services to represent "overly long" numbers in responses without format parameter IEEE754Compatible=true as an instance annotation on the numeric property with term Core.ValueException  containing the exact value as a string. The service MAY also include the numeric property with a rounded/inexact value as a JSON number. This is not supported in request payloads, clients can use format parameter IEEE754Compatible=true and pass all Int64 and Decimal values as strings.