class_docstr: Lightweight class that maintains a basic queue of operations, in addition
  to metadata annotations.
code: def items(self):
      return tuple((key.obj, value) for key, value in super().items())
  
imports: import copy
  from collections import OrderedDict
  from contextlib import contextmanager
  from threading import RLock
  from typing import Optional
label_desc: Use image node_id 7 for calling the AnnotatedQueue obj's underlying member method code with example usage: obj.items() and returns: tuple