input[number] validation error if modelvalue is undefined

[robbro]

In form1 the number validator will report "Not a number" even though modelvalue is not required and is undefined. If modelvalue is null (form2) the number validator error is not present. I'd expect no validation error in form1 since modelvalue is not required, is this a bug or am I missing something?

Note: If I remove "ng-required=false" from input in form1 there are no validation errors.

Angular Version(s): AngularJS 1.3.0 rc3
Browsers: Firefox and Chrome latest
Plunker: http://plnkr.co/edit/gCZhWaTLgdJLgXoJs0Nu?p=preview

<form name="form1">
   <input type="number" id="field1" name="field1" ng-model="undefinedModelvalue" ng-required="false">
   <span ng-show="form1.field1.$error.number">Not a number</span>
   <span ng-show="form1.field1.$error.required">Required</span>
</form>
<form name="form2">
   <input type="number" id="field1" name="field1" ng-model="nullModelvalue" ng-required="false">
   <span ng-show="form2.field1.$error.number">Not a number</span>
   <span ng-show="form2.field1.$error.required">Required</span>
</form>

[gkalpak]

This is a duplicate of #9106.

[caitp]

Thanks @gkalpak --- closing this as a duplicate, I am looking at 9106 today