code: def decode(cls, line):
          
          if line.encoded:
              encoding = getattr(line, 'encoding_param', None)
              if encoding and encoding.upper() == cls.base64string:
                  line.value = b64decode(line.value)
              else:
                  line.value = stringToTextValues(line.value)[0]
              line.encoded = False
docs: Remove backslash escaping from line.value.