class_docstr: Accept values that are instances of any class.
  
  .. note::
      This is primarily useful for validation purpose. Non-serializable
      objects will fail regardless during the serialization process.
class_docstr_tok: ["Accept","values","that","are","instances","of","any","class",".","..","note",":",":","This","is","primarily","useful","for","validation","purpose",".","Non-serializable","objects","will","fail","regardless","during","the","serialization","process","."]
code: def has_ref(self) -> bool:
      return True
  
imports: from __future__ import annotations
  import logging
  import types
  from importlib import import_module
  from typing import Any, Callable, Generic, TypeVar
  from ..has_props import HasProps
  from ..serialization import Serializable
  from ._sphinx import model_link, property_link, register_type_link
  from .bases import Init, Property
  from .singletons import Undefined
label_desc: Use image node_id 4 for calling the Object obj's underlying member method code with example usage: obj.has_ref() and returns: True