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:param references: An iterable of iterables of keys. Each is a
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reference to another key.
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:param value: The value to associate with the key. It may be any
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# we don't care about absent_references
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node_refs, _ = self._check_key_ref_value(key, references, value)
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raise errors.BadIndexDuplicateKey(key, self)
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if self._nodes_by_key is not None and self._key_length > 1:
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self._update_nodes_by_key(key, value, node_refs)
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self._spill_mem_keys_to_disk()