code: def ragged_or_nan(a):
      if np.isscalar(a) and np.isnan(a):
          return a
      else:
          return _RaggedElement(a)
  
imports: from __future__ import annotations
  import re
  from functools import total_ordering
  from packaging.version import Version
  import numpy
  import pandas
  from numba import jit
  from pandas.api.extensions import ExtensionDtype, ExtensionArray, register_extension_dtype
  from numbers import Integral
  from pandas.api.types import pandas_dtype, is_extension_array_dtype
label_desc: Use image node_id 1 for calling the _RaggedElement obj's underlying member method code with example usage: obj.ragged_or_nan(a) and returns: a, _RaggedElement