# File lib/fakefs/pathname.rb, line 196
      def cleanpath_aggressive
        path = @path
        names = []
        pre = path
        while (r = chop_basename(pre))
          pre, base = r
          case base
          when '.'
          when '..'
            names.unshift base
          else
            if names[0] == '..'
              names.shift
            else
              names.unshift base
            end
          end
        end
        if /#{SEPARATOR_PAT}/o =~ File.basename(pre)
          names.shift while names[0] == '..'
        end
        self.class.new(prepend_prefix(pre, File.join(*names)))
      end