# File lib/chef/mixin/deep_merge.rb, line 40
      def role_merge(first, second)
        first  = Mash.new(first)  unless first.kind_of?(Mash)
        second = Mash.new(second) unless second.kind_of?(Mash)

        DeepMerge.deep_merge(second, first, {:knockout_prefix => "!merge", :preserve_unmergeables => false})
      end