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In the 3.0.0 changelog it says:
I know that it's still in the docs, but does this mean that the validationHasFailed method is deprecated?
Yes. It was removed. We are working on the doc now.
Check blog post about 3.0.0. There is how to use new validation in model - basically it's the same validation like in forms.
Vokuro has been updated to use the new validation scheme.