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Implementation status #71
It could be too late for consensus when most of browsers will start to ship it on by default.
While next TC39 meeting will happen on September 25
So if feature won't be approved in the time when it will be shipped in most browsers then it won't go to spec. Though browsers can't unship this feature. Probably other environments will also ship that unspecced feature to make it possible to port code which works on those browsers to their platform. It seems like a big problem. Not sure I understand you correctly though