class_docstr: Registry of available options for a given config system.
  
  Define new options using the :meth:`register()` method.
  
  Access existing options using the Mapping interface.
class_docstr_tok: ["Registry","of","available","options","for","a","given","config","system",".","Define","new","options","using","the",":","meth",":","`","register","(",")","`","method",".","Access","existing","options","using","the","Mapping","interface","."]
docstr: Return True if the same option object is already registered.
docstr_tok: ["Return","True","if","the","same","option","object","is","already","registered","."]
code: def is_registered(self, option: Option) -> bool:
      """Return True if the same option object is already registered."""
      return self.__options.get(option.name) is option
  
imports: from __future__ import annotations
  import logging
  from dataclasses import dataclass
  from typing import Any, Callable, ClassVar, Dict, Iterable, Mapping, MutableMapping, Optional, Set, Union
label_desc: Use image node_id 4 for calling the Options obj's underlying member method code with example usage: obj.is_registered(option) and returns: unknown