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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 (key, value) or (key, value, reference_lists).
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:return: An iterable of (index, key, value) or (index, key, value, reference_lists).
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The former tuple is used when there are no reference lists in the
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index, making the API compatible with simple key:value index types.
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There is no defined order for the result iteration - it will be in