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parameters to an algorithm QgsProcessingAlgorithm::addParameter() has a new createOuput argument (true by default). If the createOutput argument is true, then a corresponding output definition will also be created (and added to the algorithm) where appropriate. E.g. when adding a QgsProcessingParameterVectorDestination and createOutput is true, then a QgsProcessingOutputVectorLayer output will be created and added to the algorithm. There is no need to call addOutput() to manually add a corresponding output for this vector. If createOutput is false then this automatic output creation will not occur. This should simplify declaration of outputs for algorithms as it avoids the need to manually declare these corresponding outputs.