class_docstr: A dict with a mutation flag.
code: def __setitem__(self, key, value):
      self._mutated = True
      return super().__setitem__(key, value)
  
imports: import collections
  import functools
  from typing import Any, Callable, Hashable, Mapping, Optional
  from tensorflow.core.function import trace_type
  from tensorflow.python import pywrap_tfe
  from tensorflow.python.framework import dtypes
  from tensorflow.python.types import core
  from tensorflow.python.util import object_identity
label_desc: Use image node_id 3 for calling the MutationAwareDict obj's underlying member method code with example usage: obj.__setitem__(key, value) and returns: super