New JavaScript features in ES2019:
Array#{flat,flatMap}
Object.fromEntries
String#{trimStart,trimEnd}
Symbol#description
try { } catch {} // optional binding
JSON ⊂ ECMAScript
well-formed JSON.stringify
stable Array#sort
revised Function#toString
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Could you please clarify, what does it mean JSON to be a subset of ES? Is it something about U+2028/U+2029?
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Of course it can change. Internet media types are designed to be revised with additional functionality, especially with features that were previously syntax errors.
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