Dart's immutable collections

By default collections such as lists are mutable in Dart. There are however immutable versions also available such as UnmodifiableListView, UnmodifiableMapView, and UnmodifiableSetView. Unfortunately, they are imperfect and lead to potential runtime errors. Let's have a look into that.

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UnmodifiableListView: https://api.dart.dev/stable/2.18.2/dart-collection/UnmodifiableListView-class.html
kt_dart: https://pub.dev/packages/kt_dart

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