Rails core - Apr 2011 - Rack Environment Modification Problems on Multiple Calls?

Taken from https://github.com/intridea/omniauth/issues/239 - I''m not
sure
what the issue might be here, wondering if someone on Rails core might know 
why this behavior is happening.

It seems that it''s even easier to reproduce. If you call the following
line
in a before_filter:
    request.env[''warden''].authenticate(:scope => :user)

and add a middleware looking like this (to simulate OmniAuth strategy that 
calls app twice, each time with different env):

    class Kaboom
      def initialize(app)
        @app = app
      end

      def call(env)
        @app.call(env.dup) # call 1
        @app.call(env)     # call 2
      end
    end

 Then `params[:controller]` and `params[:action]` are missing in every 
request.

If you remove the before filter __or__ change the first call in the 
middleware to `@app.call(env)` (without .dup) it works fine.

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