next element.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/iterator.next.php
	 */
	#[ReturnTypeWillChange]
	public function next() {
		next( $this->blocks );
	}

	/**
	 * Checks if current position is valid.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/iterator.valid.php
	 */
	#[ReturnTypeWillChange]
	public function valid() {
		return null !== key( $this->blocks );
	}

	/**
	 * Returns the count of blocks in the list.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/countable.count.php
	 *
	 * @return int Block count.
	 */
	#[ReturnTypeWillChange]
	public function count() {
		return count( $this->blocks );
	}
}