Hash.new memory leak

gistfile1.rb

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    first = UINavigationController.alloc.initWithRootViewController(RootController.new)
    first.pushViewController(TestController.new, animated: false)
    first.pushViewController(TestController.new, animated: false)
    first.pushViewController(WorkingController.new, animated: false)
    @window.rootViewController = first
    @window.makeKeyAndVisible
    true
  end
end


class RootController < UIViewController
end


class WorkingController < UIViewController

  def viewDidLoad
    puts "loaded WorkingController"
    @hash = Hash.new(0)
  end

  def viewDidAppear(animated)
    self.navigationController.popViewControllerAnimated(true)
  end

  def dealloc
    puts "dealloc WorkingController"
    super
  end
end


class TestController < UIViewController

  def viewDidLoad
    puts "loaded TestController"
    @hash = Hash.new do |hash,key|
      hash[key] = 0
    end
  end

  def viewDidAppear(animated)
    self.navigationController.popViewControllerAnimated(true)
  end

  def dealloc
    puts "dealloc TestController"
    super
  end

end