JSON.stringify error when making AJAX calls.

I'm attempting to load a JSON object via a $.ajax call and am getting a weird error. It works fine on the iPad and iPhone simulators (iOS 5.1), but when testing on a real device (iPad iOS 5.1.1) I receive the following error (courtesy of $(document).ajaxError).

2012-05-13 20:21:12.955 Modeling[555:707] [INFO] TypeError: JSON.stringify cannot serialize cyclic structures.

The example json file I am loading can be found at:
http://api.geonames.org/countryInfoJSON?formatted=true&lang=it&country=DE&username=demo&style=full

There is no cycles or references, so the error received does not pertain to the source.

Setup One (Successful):

• iPhone Simulator - iOS 5.1
• Cordova 1.7.0
• jQuery 1.7.1 (& 1.7.2)

Screenshot: http://i.imgur.com/MlFZ0.png

The source was retrieved using $.ajax successfully (response "success").

Setup One (Failure):

• Physical iPad 2 - iOS 5.1.1
• Cordova 1.7.0
• jQuery 1.7.1 (& 1.7.2)

Screenshot: http://i.imgur.com/e516V.png

The url was NOT successfully processed. An error of "JSON.stringify cannot serialize cyclic structures." is given.

Source code (example cordova index.html): https://gist.github.com/2698397

As a side note, this was not an issue when using Cordova 1.5 or 1.6.1 (on iOS 5.1, NOT 5.1.1). If you need any further details please let me know.

This is a cross post from a jQuery bug report, as I am not sure if this is a Cordova or jQuery issue.
http://bugs.jquery.com/ticket/11762