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Niva is a Smalltalk-like language with static types:

An implementation of Boids for Niva:

Maybe some comparison with Strongtalk?

Here I have listed all the main differences from standard Smalltalk syntax, including a couple of examples of syntax for type declarations https://www.reddit.com/r/smalltalk/comments/1xak1cw/comment/...

Basically its Receiver key: Type = [body] or Receiver key(localName): Type