Endpoint returns invalid geojson: coordinates are strings instead of numbers

[pietervdvn]

Hi,

An API call to /v2/challenge/view (e.g. https://maproulette.org/api/v2/challenge/view/39519) returns an invalid geojson: the coordinates should be an array of numbers (e.g. [12.34, 5.67]) but this returns an array of strings, containing the numbers (e.g. ["12.34", "5.67"]) causing a whole heap of bugs in my programs.

Example output screenshot:

The full response can be found in this zip-file: challenge_geojson.json.zip