Please note this example:

JSFiddle Sample

    <div ng-controller=myCtrl>

    var ng-model = {{myValue}} - {{myType}}



       <input type=radio value=true 

    name=boolean ng-change=logIt() ng-model=myValue /> True

        <input type=radio value=false 

    name=boolean ng-change=logIt() ng-model=myValue /> False



    </div>

    var myApp = angular.module('myApp',[]);



    function myCtrl($scope)

    {    

        $scope.myValue = true; //does not work

        //$scope.myValue = 'true'; //it does work

        $scope.myType =(typeof $scope.myValue);    

        $scope.logIt=function(){

            $scope.myType =(typeof $scope.myValue);

        }

    }

As you can see initially typeof is of type boolean but after selecting a value it changes to string, and true is not equal to 'true'. Is there any way I can make angular preserve the original type.

At this point I am considering to write my own directive to control this behavior but it does not look right that angular changes the original type, am I correct?.