Rails core - Sep 2012 - Overriding class_attribute writers and order of super/extend C.M./included block eval in ActiveSupport::Concern

I have:

module MySpike      
  extend ActiveSupport::Concern
  included do
    class_attribute :foobar, instance_writer: true
  end
end

But, I want to be able to override the class attribute writer and/or 
instance writer method to do something when the attribute is set via 
self.foobar = true before or after calling super to set the attribute.

Unfortunately, I can''t find a clean way of doing this, and it is a
little
confusing when the order of things is typically to put included at the top 
even though it isn''t evaluated before ClassMethods is extended, etc.

I''m not sure if it would help, but would be nice if the order of the 
following that happen in Concern''s def append_features(base) method
were
different and maybe then I could just override things in the ClassMethods 
module for class methods and the main block of the module for instance 
methods:

        super
        base.extend const_get("ClassMethods") if 
const_defined?("ClassMethods")
        base.class_eval(&@_included_block) if 
instance_variable_defined?("@_included_block")

And there are classes like this that only benefit from the dependency 
handling and included block class_eval part of Concern that maybe could 
benefit from that being split up somehow?:

actionpack/lib/abstract_controller/asset_paths.rb:

module AbstractController
  module AssetPaths #:nodoc:
    extend ActiveSupport::Concern

    included do
      config_accessor :asset_host, :asset_path, :assets_dir, 
:javascripts_dir,
        :stylesheets_dir, :default_asset_host_protocol, :relative_url_root
    end
  end
end

Sorry if this is an uninformed way of looking at it. I guess if it was 
problematic it would have been solved already. Thanks for listening though.

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