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

I have an input field which I want he user to input a number, so I have made an input field with type="number".

When I use it in 1.2 I get no errors

    <script src="http://ift.tt/1yCFzY6"></script>
    <script>
          var app = angular.module('app', []);
            app.controller('MainCtrl', ['$scope', function ($scope) {
                $scope.person = [
                {"name": "Alex","pts": "10"}
            ];
            }]);
    </script>
        <div ng-app="app">
                <div ng-controller="MainCtrl">
                  {{person | json }}<br>
                  name: <span ng-bind="person[0].name"></span></br>
                  <!-- pts: <input ng-model="person[0].pts"> -->
                  pts: <input type="number" ng-model="person[0].pts"><br?
            </div>
        </div>

http://ift.tt/1N4e2ZV

However when I use it in 1.3 I get Error: [ngModel:numfmt] but when i update the number it still seems to get bound to the scope.

    <script src="http://ift.tt/1DTrZWe"></script>
    <script>
          var app = angular.module('app', []);
            app.controller('MainCtrl', ['$scope', function ($scope) {
                $scope.person = [
                {"name": "Alex","pts": "10"}
            ];
            }]);
    </script>
        <div ng-app="app">
                <div ng-controller="MainCtrl">
                {{person | json }}<br>
                  name: <span ng-bind="person[0].name">
                  name: <span ng-bind="person[0].name"></span></br>
                  <!-- pts: <input ng-model="person[0].pts"> -->
                  pts: <input type="number" ng-model="person[0].pts">
            </div>
        </div>

http://ift.tt/1N4e2ZX

Am I doing something wrong here or is this nothing to worry about? I would prefer not to have the errors in my console, when I am trying to debug other issues