Good news. It’s about to land. One nice thing about Dart is that they are extremely transparent in how they design the language. You can check out the entire re

Good news. It’s about to land. One nice thing about Dart is that they are extremely transparent in how they design the language. You can check out the entire repo here for an example of what I mean but if we are talking about these specific features this is a good place to start Here is the intro: https://github.com/dart-lang/language/blob/master/accepted/future-releases/0546-patterns/goals-and-constraints.md https://github.com/dart-lang/language/blob/master/accepted/f... Here is the spec of what they are currently implementing: https://github.com/dart-lang/language/blob/master/accepted/future-releases/0546-patterns/feature-specification.md https://github.com/dart-lang/language/blob/master/accepted/f... I think they both serve as a really good example of the kind of thoughtful approaches the language team are known for which coming from some different language communities previously I wasn’t accustomed to.