It seems like the Superhero emoji (🦸) is reported with a width of 1, however since it's an emoji I think the correct width should be full-width (2). As far as I can tell, this should also be unrelated to #4, since we're not dealing with composition here.

I would have just sent a PR, but I wasn't sure if adding it to the character width table as a full width character would be correct. It might also be interesting to see if other emojis have this problem too, I wasn't able to find any though.