class_docstr: A small serializable object to wrap literal values without copying
code: def __call__(self):
      return self.data
  
imports: from __future__ import annotations
  from collections import defaultdict
  from collections.abc import Collection, Iterable, Mapping
  from typing import Any, Literal, TypeVar, cast, overload
  from dask.typing import Graph, Key, NoDefault, no_default
label_desc: Use image node_id 4 for calling the literal obj's underlying member method code with example usage: obj.__call__() and returns: self