e equal.
	 */
	private static function longest_first_then_alphabetical( string $a, string $b ): int {
		if ( $a === $b ) {
			return 0;
		}

		$length_a = strlen( $a );
		$length_b = strlen( $b );

		// Longer strings are less-than for comparison's sake.
		if ( $length_a !== $length_b ) {
			return $length_b - $length_a;
		}

		return strcmp( $a, $b );
	}
}