Ensure ChangeRecord list is cleaned up while iterating
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caitp commented
dart-archive/angular.dart@75fbded addresses an issue: ChangeRecord lists can reference deleted groups, and keep those groups alive when they ought to be discarded.
The implementation in Dart fixes this with a new ChangeIterator class, as well as some additional cleanup in DirtyCheckingChangeDetectorGroup#remove()
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I think this might be implemented in a simpler way with ES6 by adding a custom iterator to the ChangeRecord class, but this still makes usage of the API a bit more awkward. We'll see.