Hello angular team!

Overview of the Issue - incorrect attributes aria-checked and tabindex are applied to the input of type radio: when radio is selected, the following attributes are applied: aria-checked="false", tabindex="-1".
Motivation for or Use Case - radio button never gets selected when pressing Tab
Angular Version(s) - 1.3.1 for all modules
Browsers and Operating System - Chrome 38.0.2125.111 m. Haven't tested in other browsers, but pretty sure it'll be the same.
Reproduce the Error - see Plunker.
Related Issues - not found
Suggest a Fix - Switching attribute value to ng-value fixes the issue, but it is inconsistent through out the angular's logic - it was able to figure out that the radio should be selected with the regular value attribute, but it could not figure out correct accessibility attributes. It appears the issue has to do with the following lines of code