You can set the default output-extension of a model in processing > options > general. The intermediate transactions in a model are processed in that default file format.
After installing QGIS, the default extension is set to 'shp'.
A well-known disadvantage of using shp is the restriction in attributenames (set to 10 characters).
When I set the default to eg. 'geojson' I can evade the naming-restriction. But I then get some other errors on processing geometries.
So I'm looking for an explanation of the advantages and disadvantages of the different output-extensions used in the graphical modeller.
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