Looks like the work on Dart libraries is really picking up. It was announced that dart:coreimpl is being removed, and some methods on numbers are now more simple getters.
dart:coreimpl will be removed
Anders Johnsen wrote to the Dart mailing list:
I've already started moving implementation classes out of dart:coreimpl and making them a private member of dart:core. I'll continue to move the rest over the week.
Once the move is done, we intent to re-expose some of the same functionality in other libraries.
If you are currently using any of the classes in dart:coreimpl, you can make a local copy for your program to use, and file a bug for a feature request in the library area on http://dartbug.com/new.
isNaN and friends are now getters
Florian Loitsch also wrote:
Starting with r13974, you'll find that isNaN, isInfinite, isEven, isOdd, isNegative on numbers are now getters. In the same CL I updated the fixnum pkg where I also change isZero, isMaxValue and isMinValue.
In general the fix should be easy:
d.isNaN() -> d.isNaN, ...