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THe problems that Dart solves as of now will probably be fixed in ECMAScript6 and TypeScript as well. Also the speed of Asm.js being implemented into V8 will definitely boost V8's speed.

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But the problems won't be fixed because fixing them would break most JavaScript programs. TC39 is not going to split [] from property access, or (or planning to, afaik) make undefined property access throw, or make method tear-offs have a lexically bound 'this' by default, or seal all objects by default, or fix for loop variable bindings, or remove == in favor of ===, or remove the type coercions, add .==/.equals and .hashCode() to all objects, allow any object to be Map keys, etc.

Dart does way more than adding types. If ECMAScript changed all of that (and much more), it'd be a different language. It'd be Dart :)

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