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The main example is that Dart's basic numeric types can't be represented in JavaScript. Dart VM integers are bignums, while dart2js numbers are IEEE754 doubles.

• beavis2 12y ago
  That's for performance because I guess the majority of users would probably not notice the difference. They can be represented in JS, but not natively.
  • azakai 12y ago
    Yes, the decision to make numeric types incompatible between the VM and dart2js was due to speed concerns.