return new Object[0];
      }
      Map<K, V> delegate = delegateOrNull();
      return (delegate != null)
          ? delegate.keySet().toArray()
          : ObjectArrays.copyAsObjectArray(requireKeys(), 0, size);
    }

    @Override
    @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
    public <T extends @Nullable Object> T[] toArray(T[] a) {

  }

  /**
   * Returns a copy of the specified subrange of the specified array that is literally an Object[],
   * and not e.g. a {@code String[]}.
   */
  static @Nullable Object[] copyAsObjectArray(@Nullable Object[] elements, int offset, int length) {
    checkPositionIndexes(offset, offset + length, elements.length);
    if (length == 0) {
      return new Object[0];
    }

  }

  /**
   * Returns a copy of the specified subrange of the specified array that is literally an Object[],
   * and not e.g. a {@code String[]}.
   */
  static @Nullable Object[] copyAsObjectArray(@Nullable Object[] elements, int offset, int length) {
    checkPositionIndexes(offset, offset + length, elements.length);
    if (length == 0) {
      return new Object[0];
    }