Comment User ID template tag
There are many template tags for a comment author (name, url, ip, etc), but I'm missing one tag, the WordPress User ID of the comment author (if registered). WordPress does actually save the User ID already, the only problem is that you can't access it with a template tag.
Although I haven't played around with it much, I think this should get the ID:
So, you could do something like this:
$user = get_userdata($comment->user_id);
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