text: class AbsentType:
  
      """Type to represent a missing value where ``None`` would be ambiguous."""
  
      __INSTANCE = None
  
      def __new__(cls):
          if cls.__INSTANCE is None:
              cls.__INSTANCE = super().__new__(cls)
          return cls.__INSTANCE
  
      def __bool__(self) -> bool:
          return False
  
      def __repr__(self) -> str:
          return "Absent"
  
      def __str__(self) -> str:
          return repr(self)
  
  
  Absent = AbsentType()
  Absent.__doc__ = AbsentType.__doc__
  