this.keyHashTable = null;
    this.alternatingKeysAndValues = new Object[0];
    this.keyOffset = 0;
    this.size = 0;
    this.inverse = (RegularImmutableBiMap<V, K>) this;
  }

  /** K-to-V constructor. */
  RegularImmutableBiMap(@Nullable Object[] alternatingKeysAndValues, int size) {
    this.alternatingKeysAndValues = alternatingKeysAndValues;
    this.size = size;
    this.keyOffset = 0;

    List<? extends Entry<?, ?>> entries = Lists.newArrayList(map.entrySet());
    List<Object> keys = Lists.newArrayList(map.keySet());
    List<Object> values = Lists.newArrayList(map.values());
    assertEquals(2 * entries.size(), alternatingKeysAndValues.length);
    assertEquals(2 * keys.size(), alternatingKeysAndValues.length);

    List<? extends Entry<?, ?>> entries = Lists.newArrayList(map.entrySet());
    List<Object> keys = Lists.newArrayList(map.keySet());
    List<Object> values = Lists.newArrayList(map.values());
    assertEquals(2 * entries.size(), alternatingKeysAndValues.length);
    assertEquals(2 * keys.size(), alternatingKeysAndValues.length);