normalize_defaults!

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 146
          def normalize_defaults!
            @defaults.merge!(scope[:defaults]) if scope[:defaults]
            @defaults.merge!(options[:defaults]) if options[:defaults]

            options.each do |key, default|
              unless Regexp === default || IGNORE_OPTIONS.include?(key)
                @defaults[key] = default
              end
            end

            if options[:constraints].is_a?(Hash)
              options[:constraints].each do |key, default|
                if URL_OPTIONS.include?(key) && (String === default || Fixnum === default)
                  @defaults[key] ||= default
                end
              end
            end

            if Regexp === options[:format]
              @defaults[:format] = nil
            elsif String === options[:format]
              @defaults[:format] = options[:format]
            end
          end