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i Z i Z i Z d d � Z d d � Z d d � Z d S)z�Helper to provide extensibility for pickle.
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Wn Yn X| S) a� Return a list of slot names for a given class.
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r? c C s� t | � } d | k o# d k n s4 t d � � | | f } t j | � | k rn t j | � | k rn d S| t k r� t d | t | f � � | t k r� t d | t | f � � | t | <| t | <d S)zRegister an extension code.r i���zcode out of rangeNz)key %s is already registered with code %sz$code %s is already in use for key %s)�int�
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c C sq | | f } t j | � | k s6 t j | � | k rL t d | | f � � t | =t | =| t k rm t | =d S)z0Unregister an extension code. For testing only.z%key %s is not registered with code %sN)rB r6 rC rA �_extension_cache)rD r> rE rF r r r
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