old_contents: # -*- coding: utf-8 -*-
  """
  rio._compact
  ~~~~~~~~~~~~~
  """
  
  try:
      import cPickle as pickle
  except ImportError:
      import pickle  # noqa
  
  try:
      from cStringIO import StringIO
  except ImportError:
      from StringIO import StringIO  # noqa
  
new_contents: # -*- coding: utf-8 -*-
  """
  rio._compact
  ~~~~~~~~~~~~~
  """
  
  try:
      import cPickle as pickle
  except ImportError:
      import pickle  # noqa
  
  try:
      from cStringIO import StringIO
  except ImportError:
      from StringIO import StringIO  # noqa
  
  try:
      import simplejson as json
  except ImportError:
      import json
  
subject: add json.