old_contents: from checkio_referee import RefereeBase
  
  import settings
  import settings_env
  from tests import TESTS
  
  
  cover = """def cover(func, data):
      return func(*[str(x) for x in data])
  """
  
  
  class Referee(RefereeBase):
      TESTS = TESTS
      EXECUTABLE_PATH = settings.EXECUTABLE_PATH
      CURRENT_ENV = settings_env.CURRENT_ENV
      FUNCTION_NAME = "boolean"
      ENV_COVERCODE = {
          "python_2": cover,
          "python_3": cover,
          "javascript": None
      }
  
new_contents: from checkio_referee import RefereeBase
  from checkio_referee import representations
  
  import settings
  import settings_env
  from tests import TESTS
  
  
  cover = """def cover(func, data):
      return func(*[str(x) for x in data])
  """
  
  
  class Referee(RefereeBase):
      TESTS = TESTS
      EXECUTABLE_PATH = settings.EXECUTABLE_PATH
      CURRENT_ENV = settings_env.CURRENT_ENV
      FUNCTION_NAME = "boolean"
      CALLED_REPRESENTATIONS = {
          "python_3": representations.unwrap_arg_representation,
          "python_2": representations.unwrap_arg_representation,
          "javascript": representations.unwrap_arg_representation
      }
      ENV_COVERCODE = {
          "python_2": cover,
          "python_3": cover,
          "javascript": None
      }
  
subject: add representation