docs: def smart_content_encoding(self):
          """Smart content encoding."""
          encoding = self.content_encoding
          if not encoding:
              base_list = self.basename.split('.')
              while (not encoding) and len(base_list) > 1:
                  _, encoding = mimetypes.guess_type('.'.join(base_list))
                  base_list.pop()
  
          return encoding