         if let passed = passed
             { json["passed"] = passed }
         if !children.isEmpty
-            { json["children"] = children.map { $0.toJson } as NSArray }
+            { json["children"] = children.map { $0.toJson } }
         return json
         }
     }


    var toJson: [String:Any]
        {
        var json: [String:Any] = ["name": name as AnyObject]
        if let callsite = callsite
            {
            json["file"] = callsite.file

        if !resultsDirty
            { return }

        let json = ["results": results.toJson["children"]!]
        let jsonData = try! JSONSerialization.data(withJSONObject: json, options: [])
        if !((try? jsonData.write(to: URL(fileURLWithPath: "/tmp/siesta-spec-results.json"), options: [.atomic])) != nil)
            { print("unable to write spec results json") }
