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  • If you want to see a new tag added, please ask on Meta so the community can decide if it's a tag that should be created. I removed the request from your question as it was irrelevant to your actual question. Commented Feb 5, 2017 at 15:48
  • Using Firefox 51 I see Array [ undefined, <1 empty slot>, 42 ] and Array [ true, <1 empty slot>, false ], respectively. This seems to support the accepted answer. Commented Feb 6, 2017 at 14:09
  • @Jacob Raihle, I agree with you. I believe that my initial question, my labelled update to my question, the accepted answer and your comment are all in agreement with each other. Do you see a conflict? Commented Feb 6, 2017 at 14:34
  • I don't see a conflict, but I must have based my comment on the old version of your question. Nevermind. Commented Feb 6, 2017 at 15:35