[TIMOB-3062] JSON.parse changes order of data

I am using Mobile SDK 1.5.1 and when I recieve JSON from my server, I can see its in a particular order.
These are reverse order timestamp posts from a phpBB forum.

When I JSON.parse the response I get them in a different order on both Android and iOS.
If I run eval the results are in the correct original order.

I can see with Ti.API.info that the app is getting the original JSON in the correct order.

Heres how the JSON looks:

{
"3":{ "isUnread":"", "title":"Games", "replies":"1987", "startedBy":"User", "lastPostTime":"Mon Oct 04, 2010 8:39 pm", "lastPostBy":"User", "lastPosterUID":"4" },
"5":{ "isUnread":"", "title":"General", "replies":"2689", "startedBy":"User", "lastPostTime":"Mon Oct 04, 2010 8:38 pm", "lastPostBy":"User", "lastPosterUID":"4" }, 
"163":{ "isUnread":"", "title":"Europeland", "replies":"313", "startedBy":"User", "lastPostTime":"Mon Oct 04, 2010 8:00 pm", "lastPostBy":"User", "lastPosterUID":"2" },
"END":"END"
}