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That document is an incomplete working DRAFT for the next edition of the ECMAScript standard.

Don't assume that the current snapshot is feature complete.

More strongly, the draft is incomplete by its very nature. If you care about having only complete and ratified standards, do not use the GitHub snapshot. Use the official versions hosted on ECMA's website (https://www.ecma-international.org/memento/TC39-M.htm).

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