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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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c C sw | | f } t j | � | k s6 t j | � | k rO t d | | f � � n t | =t | =| t k rs t | =n d S)z0Unregister an extension code. For testing only.z%key %s is not registered with code %sN)r@ r4 rA r? �_extension_cache)rB r< rC rD r r r
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