Bignums are good, in Dart as in other languages. On the agenda for "Harmony-era" ECMAScript, going back to 2009:
http://wiki.ecmascript.org/doku.php?id=strawman:bignums
More recent work generalizes value types into an extension mechanism for JS, so you can have built-in and user-defined numeric types with operators and literals.
Bignums are good, in Dart as in other languages. On the agenda for "Harmony-era" ECMAScript, going back to 2009:
http://wiki.ecmascript.org/doku.php?id=strawman:bignums
More recent work generalizes value types into an extension mechanism for JS, so you can have built-in and user-defined numeric types with operators and literals.