code: def sanitize_index(data, index, copy=False):
      
  
      if index is None:
          return data
  
      if len(data) != len(index):
          raise ValueError('Length of values does not match length of index')
  
      if isinstance(data, ABCIndexClass) and not copy:
          pass
      elif isinstance(data, (ABCPeriodIndex, ABCDatetimeIndex)):
          data = data._values
          if copy:
              data = data.copy()
  
      elif isinstance(data, np.ndarray):
  
          # coerce datetimelike types
          if data.dtype.kind in ['M', 'm']:
              data = sanitize_array(data, index, copy=copy)
  
      return data
docs: Sanitize an index type to return an ndarray of the underlying, pass
      through a non-Index.