properties such as distance and travel_time should be Int, not String

[ajakubauskas]

Some of the properties returned by routing, time-filter etc. are of the wrong type: we can safely assume distance and travel_time will be a single integer therefore it would be nice if such values returned to qgis layers would be of corresponding type.
I suggest adding something like:

def propType(propName):
            if propName == "distance" or propName == "travel_time" :
                return QVariant.Int
            else:
                return QVariant.String

and using it in result prop processing such as calls:

traveltime-platform-qgis-plugin/travel_time_platform_plugin/algorithms/advanced.py

Line 487 in 7801910

output_fields.append(QgsField("prop_" + prop, QVariant.String, "text"))

use QgsField("prop_" + prop, propType(prop), "text") instead