this(12, DEFAULT_VALUES_PER_KEY);
  }

  private ArrayListMultimap(int expectedKeys, int expectedValuesPerKey) {
    super(Platform.newHashMapWithExpectedSize(expectedKeys));
    checkNonnegative(expectedValuesPerKey, "expectedValuesPerKey");
    this.expectedValuesPerKey = expectedValuesPerKey;
  }

  private ArrayListMultimap(Multimap<? extends K, ? extends V> multimap) {
    this(

      checkNonnegative(expectedValuesPerKey, "expectedValuesPerKey");

      // Always presize to at least 1, since we only bother creating a value collection if there's
      // at least one element.
      this.expectedValuesPerKey = max(expectedValuesPerKey, 1);

      return this;
    }

    /**

      checkNonnegative(expectedValuesPerKey, "expectedValuesPerKey");

      // Always presize to at least 1, since we only bother creating a value collection if there's
      // at least one element.
      this.expectedValuesPerKey = max(expectedValuesPerKey, 1);

      return this;
    }

    /**

    assertThrows(IllegalArgumentException.class, () -> builder.expectedValuesPerKey(-1));
  }

  public void testBuilderWithExpectedValuesPerKeyZero() {
    ImmutableListMultimap.Builder<String, String> builder =
        ImmutableListMultimap.<String, String>builder().expectedValuesPerKey(0);
    builder.put("key", "value");