# File lib/net/dns/rr/types.rb, line 98
        def self.to_str(type)
          case type
            when Fixnum
              if TYPES.invert.has_key? type
                TYPES.invert[type]
              else
                raise ArgumentError, "Unknown type number #{type}"
              end
            else
              raise ArgumentError, "Wrong type class: #{type.class}"
          end
        end