Engine's static assets taking priority over applications

When serve_static_assets = true, an engine's static assets are taking priority over an application's. This is happening on Edge Rails. I created a barebones rails app with a barebones engine and config.static_asset_paths--when loading the 'ActionDispatch::Static' middleware--is:

1.9.2:

{"/engine_app_engine"=>"/code/sandbox/engine_app/public", "/"=>"/code/sandbox/parent_app/public"}

1.8.7:

#<OrderedHash {"/"=>"/code/sandbox/parent_app/public", "/engine_app_engine"=>"/code/sandbox/engine_app/public"}>

But both result in the same FileHandlers being created in ActionDispatch::Static:

[#<ActionDispatch::FileHandler:0x1021a6960 @file_server=#<Rack::File:0x1021a66e0 @root="/code/sandbox/engine_app/public">, @at="/engine_app_engine", @compiled_root=/^\/code\/sandbox\/engine_app\/public/, @root="/code/sandbox/engine_app/public", @compiled_at=/^\/engine_app_engine/>, #<ActionDispatch::FileHandler:0x1021a66b8 @file_server=#<Rack::File:0x1021a6500 @root="/code/sandbox/parent_app/public">, @at="", @compiled_root=/^\/code\/sandbox\/parent_app\/public/, @root="/code/sandbox/parent_app/public", @compiled_at=nil>]

The engine is:

module EngineApp
  class Engine < Rails::Engine
  end
end

So when ActionDispatch::Static is getting called, it first looks in the engine's public directory, and then if not found, the applications public directory. It seems like this has something to do with initialization order. Here is where those static_asset_paths are getting set:

# in railties/lib/rails/engine.rb
  initializer :append_asset_paths do
    config.asset_path ||= default_asset_path

    public_path = paths["public"].first
    if config.compiled_asset_path && File.exist?(public_path)
      config.static_asset_paths[config.compiled_asset_path] = public_path
    end
  end

So since static_asset_paths is using an OrderedHash, this initializer must be getting called on the engine, then the application (since the application is just also an engine).

Tested on 1.9.2-p136, 1.8.7-p302