NoXrpcParams

Sentinel "no query-string parameters" value for XRPC calls that take no URL parameters (e.g. procedures with a JSON input body and nothing else, or queries with no filters). Emitted by the generator's service classes wherever a params argument is required by the XrpcClient API but the underlying lexicon def declares no parameters.

Serializes to an empty JSON object, which XrpcClient.appendQueryParams then iterates over and emits zero query params — the desired behavior.