mDataProp issue referencing variable within array

Hi, I am having two issues with using mDataProp to reference a variable inside an array:

1) Here is a live example that kind of works but field 2 displays wrong:
http://live.datatables.net/egegof/edit#javascript,html

2) Here is a live example that does not work because field 2 is null:
http://live.datatables.net/egegof/2/edit


Everything works if the field is not within an array:
http://live.datatables.net/egegof/3/edit