# File lib/rubyrep/syncers/two_way_syncer.rb, line 66
      def validate_left_right_record_handling_option(option)
        unless option.respond_to? :call
          unless [:ignore, :delete, :insert].include? option
            raise ArgumentError.new("#{option.inspect} not a valid :left_record_handling / :right_record_handling option")
          end
        end
      end