Dynamic bound property for an HTMLBars Helper in Ember

I have a list of attribute names attrs that I would like to iterate over, creating an input with a binding to that attribute on the model for each for each. The below expresses the functionality I'm after:

{{#each attr in attrs}}
  {{input value=model.get(attr) }}
{{/each}}

Of course this does not actually work, because you can't make method calls in a helper. I found this question, but the solution doesn't work in my version of Ember (1.11.0)-- I gather because this is undefined in a helper definition as of version 1.11.0 (see ).

How can I make this work?