ng-model throwing error on input type number in angular 1.3

Define the pts property as a number instead of a string:

var app = angular.module('app', []);
app.controller('MainCtrl', ['$scope', function ($scope) {
    $scope.person = [
        {"name": "Alex","pts": 10}
    ];
}]);

Add this to fix the issue:

myApp.directive('input', [function() {
    return {
        restrict: 'E',
        require: '?ngModel',
        link: function(scope, element, attrs, ngModel) {
            if (
                   'undefined' !== typeof attrs.type
                && 'number' === attrs.type
                && ngModel
            ) {
                ngModel.$formatters.push(function(modelValue) {
                    return Number(modelValue);
                });

                ngModel.$parsers.push(function(viewValue) {
                    return Number(viewValue);
                });
            }
        }
    }
}]);