Tracking if object was changed

[Kirill Grishin]

Is there a function or a property on the model to track if it was changed?

Something like:

var Dude = Serenade.Model.extend('Dude ', function() {
    this.property("name", { serialize: true });
    this.property("changed", { get: {
        function() { return isChanged() }
    } });
}

This is needed to see if any of the properties of an object were changed at all.

Thank you,
Kirill