Binding to a child component causes deprecation warning

@ctusch wrote:

When you bind to a value of a child component (using viewName) or when you observe that value in one of your properties you get the following deprecation warning:

DEPRECATION: You modified childComponent.prop twice in a single render. This was unreliable in Ember 1.x and will be removed in Ember 3.0 [deprecation id: ember-views.render-double-modify]`

I was able to reduce my problem to this code. Although in my real application I have a computed property depending on childComponent.prop which causes the same warning. prop is not part of the model.

I guess I could have an action that fires every time the value changes. But I think this should work or why else does viewName exist? Is this a bug?

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