class_docstr: A dictionary-like object that is customized to deal with multiple
  values for the same key.
  
  Each value in this dictionary will be a list. Methods which emulate
  the methods of a standard Python ``dict`` object will return or manipulate
  the first items of the lists only. Special methods are provided to
  deal with keys having multiple values.
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docstr: Returns a list of ``(key, values)`` pairs where ``values`` is the list
  of values associated with ``key``.
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code: def lists(self):
      """Returns a list of ``(key, values)`` pairs where ``values`` is the list
      of values associated with ``key``."""
      return list(self._dict.items())
  
imports: from contextlib import contextmanager
  from collections.abc import MutableMapping
  from itertools import chain
  from warnings import warn
  import os
  import tempfile
label_desc: Use image node_id 13 for calling the multidict obj's underlying member method code with example usage: obj.lists() and returns: list