md-select can't be valid when default value is 0

[wcmboy]

Actual Behavior:

• What is the issue? *md-select can't be valid when default value is 0
• What is the expected behavior?md-select should be valid when set default value.

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue:http://codepen.io/wcmboy/pen/wWYBGZ
• Details:You can see the favoriteColor1 is 0 and the favoriteColor2 is 1.The favoriteColor1 is invalid and favoriteColor2 is valid.

Angular Versions: *

• Angular Version:1.5.5
• Angular Material Version:v1.1.0-rc.5-master-8dcdf82

Additional Information:

• Browser Type: *chome
• Browser Version: * 52.0.2743.82 m
• OS: *windows 10

[ThomasBurleson]

@topherfangio - can you investigate this?

[topherfangio]

@ThomasBurleson At first glance, this appears to be a legitimate bug. I will investigate further this afternoon and see if I can write a test/fix.