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I also agree with a desire for ADT and pattern, and also some better handling of Null (see Kotlin).

But I also agree that it's a very unsurprising language, in a good way.

Non-nullability is actually being actively worked on[1]. Currently language team is working on specifying the feature and figuring out the path towards it.

[1] https://github.com/dart-lang/language/issues/110

That's great to hear, thanks for pointing it out.

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