use Set.has instead of Array.indexOf#68
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d1manson wants to merge 1 commit intowillwhite:masterfrom
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Array.indexOfis O(n), butSet.hasis O(1) ..or something similar. At any rate there's at least a 20x difference in performance given the size of the list here.I made a jsperf to demonstrate this using 1/5 of the free emails.
https://jsperf.com/array-indexof-versus-set-has/1