Fix #471: issues with input type="number"

[technohippy]

Model validators may be interfering with digesting. Validations have to be done before digesting.

[mhevery]

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[technohippy]

I've already signed the CLA for #460. My email address is: [email protected]. Please check it.

[jbdeboer]

Could you add a test to this PR demonstrating how Angular fails without this change?

[mhevery]

CLA signature found, and verified.

[mhevery]

This change should have no effect at running code. Could you please add a test which demonstrates that it fails without this change.

[wienczny]

I've found an issue that may be related. Does this bug prevent data binding and updates on input elements if there is an validator attached to the type. For me this happened when using

[mhevery]

It should not, but only a test can give you a definitive answer. Without a test we are shooting in the dark.

[wienczny]

At least the attached patch changes the behavior. You can test this by using the code from angular/angular.dart.tutorial chapter 01. Just replace type="text" with type="email".