The article <a href="https://medium.com/easy-flutter/flutter-a-mutable-model-with-changewith-method-377d132120fa" target="_blank" rel="noopener nofollow">Flutter. A mutable model with changeWith method</a> describes a different method for updating immutable state objects that circumvents quite bad situation that could manifestate in a very nasty bug.
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Explains the changeWith method for updating immutable state objects in Flutter, which helps prevent bugs related to state management.

Flutter: A mutable model with changeWith method

This is exactly the <code>.copyWith</code> that exists for ever in Flutter O.o