old_contents: from checkio_referee import RefereeBase
  from checkio_referee.covercode import py_unwrap_args
  
  import settings
  import settings_env
  from tests import TESTS
  
  
  class Referee(RefereeBase):
      TESTS = TESTS
      EXECUTABLE_PATH = settings.EXECUTABLE_PATH
      CURRENT_ENV = settings_env.CURRENT_ENV
      FUNCTION_NAME = "index_power"
      ENV_COVERCODE = {
          "python_2": py_unwrap_args,
          "python_3": py_unwrap_args,
          "javascript": None
      }
  
new_contents: from checkio_referee import RefereeBase
  from checkio_referee import covercodes,representations
  
  import settings
  import settings_env
  from tests import TESTS
  
  
  class Referee(RefereeBase):
      TESTS = TESTS
      EXECUTABLE_PATH = settings.EXECUTABLE_PATH
      CURRENT_ENV = settings_env.CURRENT_ENV
      FUNCTION_NAME = "index_power"
      ENV_COVERCODE = {
          "python_2": covercodes.py_unwrap_args,
          "python_3": covercodes.py_unwrap_args,
          "javascript": None
      }
      CALLED_REPRESENTATIONS = {
          "python_2": representations.py_tuple_representation,
          "python_3": representations.py_tuple_representation,
          "javascript": representations.py_tuple_representation,
      }
  
subject: add repr