3.2 Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119. Since JSON-RPC uses JSON, it shares the same type system as JSON (see http://www.json.org or RFC 4627). Whenever this document refers to any JSON type, the first letter is always capitaliz