Rails - Feb 2012 - Why file.js.coffee.erb is not working with respond_to?

I would like to know why a coffee-script file is not working when it''s 
named as file.js.coffee.erb and used with respond_to.

This is an example:

my_controller.rb:

def create
>   respond_to do |format|
>     format.html { render :new }
>     format.js { render :new }
>   end
> end

The file in this case is named new.js.coffee.erb

When the create route is called with Ajax, the HTML version (new.html.erb) 
is always returned. If I rename the js file as new.js.coffee then it works 
correctly.

Why can''t the .erb suffix be added?

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