normalize_format!

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 193
          def normalize_format!(formatted)
            if formatted == true
              @requirements[:format] ||= /.+/
            elsif Regexp === formatted
              @requirements[:format] = formatted
              @defaults[:format] = nil
            elsif String === formatted
              @requirements[:format] = Regexp.compile(formatted)
              @defaults[:format] = formatted
            end
          end