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The title made me think "Be afraid. Be very afraid". But it's all little stuff.

Unchecked type annotations remain the worst addition since 3.0. Actual typing might be useful; it allows optimizations and checking. But something that's mostly a comment isn't that helpful.

Both static checking and compilation can be implemented using third party libraries. I think projects like mypyc could be a real game-changer.

If you don't like unchecked annotations, then check them. It's not hard to do.

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