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Given the example CompositeDatePicker, how to react to binding validation? For example:

var field = new CompositeDatePicker();
binder.forField(field).withValidator(someValidator).bind(...);

If the validator fails, the composite fields are not set invalid and no message is displayed.

What could be a proper way to integrate with binding validation?

Depending on vaadin-core brings in a lot of transitive dependencies (e.g. all Vaadin components). It would be great to depend only on the necessary modules!