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module ActiveSupport
  class OptionMerger #:nodoc:
    instance_methods.each do |method|
      undef_method(method) if method !~ /^(__|instance_eval|class|object_id)/
    end

    def initialize(context, options)
      @context, @options = context, options
    end

    private
      def method_missing(method, *arguments, &block)
        arguments << (arguments.last.respond_to?(:to_hash) ? @options.deep_merge(arguments.pop) : @options.dup)
        @context.__send__(method, *arguments, &block)
      end
  end
end