Forms - required but empty type=number still valid

[MichaelChambers]

For this plunk: http://plnkr.co/edit/0UAKr1OGulovFUefmMDt?p=preview
I edited the forms example plunk to add a new number property, strength.

Removing the 80 strength value changes
spy.className to: form-control ng-valid ng-dirty ng-touched
strength.valid: true
strength.pristine: false

I thought it would change it to ng-invalid
If on the HTML's line 36 I change the input's type to text instead, and then remove the 80 strength, then I get the expected behavior of ng-invalid

spy.className: form-control ng-dirty ng-invalid ng-touched
strength.valid: false
strength.pristine: false

Using Chrome and 2.0.0-beta.14

[ericmartinezr]

dup of #6932 and #6248

[MichaelChambers]

Ah, thanks @ericmartinezr , sorry about that.

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