I wouldn’t consider that strange :). WordPress uses a similar method to apply the ‘alternate’ class to every other row in the tables on the admin page, something like:
<ul>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<?php $class = (empty($class) ? 'class="alternate"' : '');?>
<li <?php echo $class; ?> ><?php the_content(); ?></li>
<?php endwhile; ?>
<?php endif; ?>
</ul>
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