save_result(JSON) on aggregate_spatial result doesn't work

[soxofaan]

This works

aggregates = cube.aggregate_spatial(geometries=point_collection, reducer="mean")
aggregates.download("tmp.json")

But adding an explicit save_result fails:

aggregates = cube.aggregate_spatial(geometries=point_collection, reducer="mean")
result = aggregates.save_result(format="JSON")
result.download("tmp.json")

->

OpenEoApiError: [500] Internal: Server error: TypeError('Object of type AggregateSpatialResultCSV is not JSON serializable') (ref: r-470fdd4b75754f288153c821b7f2c1f9)

[soxofaan]

Ok found it, it's a client issue:

aggregate_spatial returns a VectorCube, which blindly adds save_result from .download():
#401