Inputs with `type="number"` setting `ng-model` to a string value

[nsatragno]

Expected:

When adding any validation to an input that has type="number", the ng-model property should be set to a numeric value, same as if there were no validations added.

Actual:

The ng-model is set to a string value instead.

How to repro:

Add any validation (such as validation-field-required) to a number field.

See this plunker for an example.