[Rails] A super-easy and great way to implement Gem configuration

Just did this in my constance gem, and totally love it as a way to add configuration or options configurability to your gem:
http://stufftohelpyouout.blogspot.com/2012/09/forget-struct-and-openstruct-flexible.html

like:

module MyModule    class << self      attr_accessor :debug, :proc, :some_mapping      def configure(&block); yield; end    end  end

I've seen people that use OpenStruct, Struct, and I had my own way to do it before this, but this seems a lot better.

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