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and is there an example @handlers block with @in, @out and @onchange lines for many different Forms (e.g. dropdown, range, button etc.)

We've done that in a few demos. The Iris Clustering UI for instance has two selectors

https://github.com/GenieFramework/GenieFrameworkDemos_NewAPI/blob/main/IrisClusteringNewAPI

Check out the tutorial here https://genieframework.com/blog/how-to-build-data-apps-with-new-genieframework-api.html

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