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def iter_all_entries(self):
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"""Iterate over all keys within the index
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:return: An iterable of (index, key, reference_lists, value). There is no
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defined order for the result iteration - it will be in the most
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efficient order for the index (in this case dictionary hash order).
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if 'evil' in debug.debug_flags:
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"iter_all_entries scales with size of history.")
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for key, (absent, references, value) in self._nodes.iteritems():