I'm trying to follow the code that produces the two return values from QgsProcessingLagorithm.parameterAsSink in Python. I can't find where the sip interface (or whatever) changes the API return value <https://qgis.org/api/classQgsProcessingAlgorithm.html#ad9a7c675082ffe996184e37cf4913e00> to the two returned values "sink" and "dest_id".
Where does it happen? What does the second parameter (destination id) refer to? Thanks, Giovanni
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