They both have basically the same functionality, with one difference being that a `Set` can work with arrays that have non-string values.
Created attachment 377375 [details] Patch
Comment on attachment 377375 [details] Patch Yay for using the standard library! <3
Comment on attachment 377375 [details] Patch Clearing flags on attachment: 377375 Committed r249185: <https://trac.webkit.org/changeset/249185>
All reviewed patches have been landed. Closing bug.
<rdar://problem/54770472>