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    @BenjaminGruenbaum - that was my point exactly. As of 2014 all the major vendors had a common implementation and thus the standards will eventually follow (ie, in 2015). Commented Oct 1, 2015 at 2:01
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    By the way: React createFragment API already relies on this... 🤔 Commented Jul 4, 2016 at 15:44
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    @BenjaminGruenbaum Your comment is false. In ES2015 the order is guaranteed only for selected methods. See answer of ftor below. Commented Oct 7, 2016 at 15:34
  • @mik01aj wanna link the source code from React that does? (yes, I'm being lazy) Commented Jan 12, 2021 at 5:47
  • @DaveDopson for point 1. it's only non-negative integer keys correct? Commented May 10, 2021 at 14:29