message: Normalize version-specific differences for Union types.
diff: @@ -95,11 +95,13 @@ else:
  return False
  -# Differences created by Generic typing.
  +# Differences created by typing implementations.
  _NORMALIZE_TYPE[(
  'tensorflow.python.framework.ops.Tensor')] = (
  "<class 'tensorflow.python.framework.ops.Tensor'>")
  _NORMALIZE_TYPE['typing.Generic'] = "<class 'typing.Generic'>"
  +# TODO(mdan): Remove once the golden files are generated in Python 3.7.
  +_NORMALIZE_TYPE["<class 'typing._GenericAlias'>"] = 'typing.Union'
  if sys.version_info.major == 3 and sys.version_info.minor >= 8:
  