Thanks, but that wasn’t what I was looking for, tho.
For future Googlers, there doesn’t seem to be a specific function, but here is something similar and simple:
$content_full = apply_filters('the_content', $post->post_content);
$content = explode("<!--nextpage-->", $content_full);
$page = count($content);
echo $page[$i];
Could you point me towards some files in WP code where I could look into?
Because I can’t just deactivate all of the plugins on a live site.
For example, let’s say the category name is “video” – full feed doesn’t show posts in that category, but if I look into, say, feed for category “other”, it will show posts that are tagged as “other” and “video”.