AngularDart 1.0.0 has issues in IE 11 and Safari 7 and below

I had AngularDart 1.0.0 throw errors in Safari 7.0 and below and IE 11 when rendering my page component. It seems to die inside the ng-repeat loop when trying to access one of the widgets (the variable it is looping over). Another one of my components (the menu) works fine. I'm not really sure what about my component caused it. An excerpt of the error is NoSuchMethodError: Cannot call "get$widget" ('undefined' is not a function (evaluating 'o.get$widget()')).

I haven't had much experience debugging an AngularDart app once it is compiled to JS but here's the context:

closure215: {
    "^": "Closure:14;",
    call$1: [function(o) {
      return o.get$widget();
    }, "call$1", null, 2, 0, null, 86, "call"],
    $isFunction: true
  },

It seems to work perfectly on most other browsers. It also worked fine with AngularDart 0.14.0 before upgrading to 1.0.0

You can see the issue in IE and Safari http://staging.daviscru.com and compare it to what it should look like in Chrome and Firefox

Here's a call stack from IE 11 using source maps (I didn't know IE had that feature):

Anonymous function [Line: 96, Col: 18], main_static_expressions.dart
DirtyCheckingRecord._getter$1 [Line: 398, Col: 3], dirty_checking_change_detector.dart
DirtyCheckingRecord.check$0 [Line: 464, Col: 25], dirty_checking_change_detector.dart
_FieldHandler.acceptValue$1 [Line: 631, Col: 5], watch_group.dart
FieldReadAST.setupWatch$1 [Line: 167, Col: 5], watch_group.dart
FieldReadAST.setupWatch$1 [Line: 158, Col: 5], watch_group.dart
FieldReadAST.setupWatch$1 [Line: 158, Col: 5], watch_group.dart
CollectionAST.setupWatch$1 [Line: 175, Col: 5], watch_group.dart
WatchGroup._addEvalWatch$7 [Line: 233, Col: 25], watch_group.dart
PureFunctionAST.setupWatch$1 [Line: 87, Col: 59], ast.dart
WatchGroup.watch$2 [Line: 140, Col: 3], watch_group.dart
Scope.watchAST$3$canChangeModel [Line: 271, Col: 5], scope.dart
Anonymous function [Line: 38, Col: 9], mustache.dart
NodeAttrs.listenObserverChanges$2 [Line: 79, Col: 5], directive.dart
AttrMustache.AttrMustache$4 [Line: 34, Col: 5], mustache.dart
AttrMustache.static.AttrMustache$ [Line: 28, Col: 3], mustache.dart
Anonymous function [Line: 259, Col: 7], element_binder.dart
ViewFactory._bindTagged$7 [Line: 77, Col: 17], view_factory.dart
ViewFactory._link$4 [Line: 119, Col: 13], view_factory.dart
ViewFactory.call$3 [Line: 58, Col: 5], view_factory.dart
ViewFactory.call$2 [Line: 62, Col: 3], view_factory.dart
Anonymous function [Line: 111, Col: 13], transcluding_component_factory.dart
Anonymous function [Line: 899, Col: 30], zone.dart
_ZoneDelegate.runUnary$3 [Line: 506, Col: 5], zone.dart
VmTurnZone__onRunUnary_closure.call$0 [Line: 122, Col: 43], zone.dart
VmTurnZone._onRunBase$4 [Line: 102, Col: 28], zone.dart
Anonymous function [Line: 121, Col: 39], zone.dart
Anonymous function [Line: 2, Col: 28], Function code (1189)
_CustomZone.runUnary$2 [Line: 801, Col: 5], zone.dart
_Future__propagateToListeners_handleValueCallback.call$0 [Line: 494, Col: 9], future_impl.dart
_Future.static._Future__propagateToListeners [Line: 578, Col: 15], future_impl.dart
_Future.static._Future__propagateMultipleListeners [Line: 431, Col: 7], future_impl.dart
_Future.static._Future__propagateToListeners [Line: 458, Col: 9], future_impl.dart
_Future._completeWithValue$1 [Line: 339, Col: 5], future_impl.dart
Anonymous function [Line: 401, Col: 7], future_impl.dart
Anonymous function [Line: 888, Col: 30], zone.dart