JSON Request returning "story arc" instead of "story_arc"?

Hello, 
 
I am working on a small little project using the API and am doing JSON requests. For the resource type "story_arc" I am doing a request, and am returned a content type with a space and not an underscore (i.e, as outlined in the documentation)  - thus my GET request URL string is:   http://api.comicvine.com/story%20arc 
 
Example:  

{

    "alias_match" = 0;

    "content_type" = "story arc";

    "content_type_id" = 39;

    "image_url" = "http://media.comicvine.com/uploads/0/9241/635555-mpsdre_003_tiny.jpg";

    name = "Dark Reign";

    pk = 55707;

    url = "/dark-reign/39-55707/";

}