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That is still Java 8, right?

(I do really like CheerpJ if only because it enables software preservation.)

Correct, but the new CheerpJ 3 archicture will let us move quite quickly to modern Java versions.

3.0 will still be focused on Java 8, with a fully new JIT architecture that does not require any AOT compilation steps or preprocessing.

With 3.1+ will begin catching up with modern Java.