Rails - Dec 2011 - respond_with :json — strange behavior

I have a controller:

  class ItemsController < ApplicationController
    respond_to :json

    def index
      groups = Item.all

      respond_with(items)
    end
  end

I am curling *my_app/items.json* and see a response with JSON object — just 
as expected. At this point I don''t have any views associated with 
controller, specifically I don''t have *index.html.erb* (*.html*).

Now if only I create an *index.haml* (for instance), with a simple *%h1 
Hello, world!* line, requesting (again via curl) *my_app/items.json* returns 
an html string with *<h1>Hello, world!</h1>*. Note that I
didn''t alter the
controller code — it just remains untouched.

I''m sure I''m missing something. Any help on explaining of
what''s happening
here?

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Oh, it''s Rails 3.2.0.rc1 by the way.

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