Tracking bug for ECMAScript proposals that reached stage 3 and are considered ready for implementation in JS engines. Bugs tracked here should be moved to the stage 4 tracking bug once they've been moved to that stage in tc39. These should be either be already implemented or be on our radar for implementation with high-ish priority. Whether we let features tracked here ride the trains or are restricted to Nightly (and perhaps Beta) is a judgement call to be made based on assumptions about the features spec stability. If we don't expect any spec churn, we can let changes ride the trains.  https://bugzilla.mozilla.org/show_bug.cgi?id=1435795
Summary: ECMAScript stage 3 proposals → [meta] ECMAScript stage 3 proposals
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