// which would cause memory leaks when non-empty HashBiMap with cyclic BiEntry
    // instances is deallocated.
    @CheckForNull BiEntry<K, V> nextInKToVBucket;
    @Weak @CheckForNull BiEntry<K, V> nextInVToKBucket;

    @Weak @CheckForNull BiEntry<K, V> nextInKeyInsertionOrder;
    @Weak @CheckForNull BiEntry<K, V> prevInKeyInsertionOrder;