The last time I used polymer was in Dart 1.3 I believe, then I migrated all to "dart:html" and started managing all the DOM events my self, so, I'm afraid I can't give you that information. Btw, thanks for your hard work, I really apreciate it.
Our pleasure. If you're curious, I'd recommend trying Polymer.dart again. The latest version (0.11) has a transformer that replaces the reflection code with static code. The resulting output is much smaller. :)