主要是web的变成stable了。desktop的也有进步，但还没进入stable状态。
Dart和Kotlin一样，也加了null safety。FFI支持了。

What’s New in Flutter 2
https://medium.com/flutter/whats-new-in-flutter-2-0-fe8e95ecc65

Flutter 2.0.0 release notes
https://flutter.dev/docs/development/tools/sdk/release-notes/release-notes-2.0.0
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