[docs]classCustom(Catalog):"""Description"""type_name:str=Field(default="Custom",allow_mutation=False)@validator("type_name")defvalidate_type_name(cls,v):ifv!="Custom":raiseValueError("must be Custom")returnvdef__setattr__(self,name,value):ifnameinCustom._convenience_properties:returnobject.__setattr__(self,name,value)super().__setattr__(name,value)_convenience_properties:ClassVar[List[str]]=[]