@Override
  public @Nullable Object[] toArray() {
    return delegate().toArray();
  }

  @CanIgnoreReturnValue
  @Override
  @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
  public <T extends @Nullable Object> T[] toArray(T[] array) {
    return delegate().toArray(array);
  }

  /**
   * A sensible definition of {@link #contains} in terms of {@link #iterator}. If you override

  @Override
  public @Nullable Object[] toArray() {
    return delegate().toArray();
  }

  @CanIgnoreReturnValue
  @Override
  @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
  public <T extends @Nullable Object> T[] toArray(T[] array) {
    return delegate().toArray(array);
  }

  /**
   * A sensible definition of {@link #contains} in terms of {@link #iterator}. If you override