in 1.3.0-rc5 'this' is undefined in service's factory call

[amaillere]

new enforceReturnValue feature in 1.3.0-rc5 0d3b69a results in 'this' being undefined in factory call :

angular.module('users').factory('Authentication', [
    function() {
        var _this = this;
        _this._data = {  // ERROR HERE 
            user: window.user
        };
        return _this._data;
    }
]);