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    A registry of objects and resources that should be closed when those
    objects are deleted.
    
    This is meant to be a safer alternative to Python's ``__del__`` method,
    which can cause reference cycles to never be collected.  Objects registered
    with the ResourceManager can be collected but still free resources when
    they die.
    
    Resources are registered using `register`, and when an object is garbage
    collected, each registered resource is closed by having its ``close()``
    method called.  Multiple resources may be registered per object, but a
    resource will only be closed once, even if multiple objects register it.
    (The last object to register it wins.)
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        Register a resource to be closed with an object is collected.
        
        When the given ``obj`` is garbage-collected by the Python interpreter,
        the ``resource`` will be closed by having its ``close()`` method called.
        Any exceptions are ignored.
        
        :param object obj: the object to track
        :param object resource:
            the resource to close when the object is collected
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