[QGIS-Developer] Python QgsProcessingLagorithm.parameterAsSink return values

[G. Allegri]

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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