ConnectApi.SmartDataDiscovery API

how_to_parse_this.java

    ConnectApi.SmartDataDiscoveryPredictInputRecords input = new ConnectApi.SmartDataDiscoveryPredictInputRecords();
    input.predictionDefinition = '0ORf0000000xxxxxxx';
    input.records = new List<Id>{'a291Y000002Exxxxxxx'};

    ConnectApi.SmartDataDiscoveryPrediction request =
      ConnectApi.SmartDataDiscovery.predict(input);

    // Everything up to here so far so good
    System.debug('ConnectApi.SmartDataDiscoveryPrediction');
    System.debug(JSON.serializePretty(request));
    List<ConnectApi.SmartDataDiscoveryPredictObject> predictions = request.predictions;
    // This is where it breaks down
    for (ConnectApi.SmartDataDiscoveryPredictObject obj : predictions) {
        ConnectApi.SmartDataDiscoveryPredict pred = obj.prediction;
        system.debug(LoggingLevel.ERROR,pred.total);
      // How do i get to these results per the doc?
      // ConnectApi.SmartDataDiscoveryPredict test = obj.prediction.total;
    }

    // Docs say you request.predictions are either 
    // - List<ConnectApi.SmartDataDiscoveryPredictObject 
    // - or List<ConnectApi.SmartDataDiscoveryPredictErrorObject
    // But casting to either of those directly don't work
    // Also Serializing/deserializing then casting to those also don't work