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Utilities for collecting objects based on "is" comparison.
Classes
class ObjectIdentityDictionary: A mutable mapping data structure which compares using "is".
class ObjectIdentitySet: Like the built-in set, but compares objects with "is".
class ObjectIdentityWeakKeyDictionary: Like weakref.WeakKeyDictionary, but compares objects with "is".
class ObjectIdentityWeakSet: Like weakref.WeakSet, but compares objects with "is".
class Reference: Reference that refers an object.