# File lib/swiftcore/Analogger.rb, line 160
      def normalize_levels(levels)
        if String === levels and levels =~ /,/
          levels.split(/,/).inject({}) {|h,k| h[k.to_s] = true; h}
        elsif Array === levels
          levels.inject({}) {|h,k| h[k.to_s] = true; h}
        elsif levels.nil?
          DefaultSeverityLevels
        elsif !(Hash === levels)
          [levels.to_s => true]
        else
          levels
        end
      end