md-input (type=number) possible bug: Restore Placeholder on empty value

Bug, feature request, or proposal:

Bug (maybe)

What is the expected behavior?

If I user an md-input with type number and delete the input value, the placeholder should go back to it’s initial place (= Inside Input box) , like placeholder get’s restored in a plain html input box.

What is the current behavior?

Upon erasing the field, console prints

"The specified value "NaN" is not a valid number. The value must match to the following regular expression: -?(\d+|\d+\.\d+|\.\d+)([eE][-+]?\d+)?"

The field is empty, but the placeholder remains ontop of the box.

What are the steps to reproduce?

See Plunker

Which versions of Angular, Material, OS, browsers are affected?

Current Angular rc5 / Material alpha.7

Is there anything else we should know?

Yes, I like your work 😃 Thank you very much.

[mmalerba]

fixed for md-input-container which will replace md-input

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