Properties are stringified in API response

[joto]

I have created task with some properties in their GeoJSON. When I access this task through the API, the properties seem to be "stringified". So I put these in:

"properties": {
  "way_id": 348147035,
  "identifier": "intersection_ways_buildings_v2_348147035"
}

And got these out:

"properties": {
  "way_id": "348147035",
  "identifier": "\"intersection_ways_buildings_v2_348147035\""
}