empty value detection in Binder#asRequired()

Vaadin 6 / 7 / 8 Framework Data Binding
1

In Binder#asRequired(), the code is:

            return asRequired(Validator.from(
                    value -> !Objects.equals(value, field.getEmptyValue()),
                    errorMessageProvider));

However HasField has a more flexible way to achieve that: HasField#isEmpty(), which by default does the same but applications can override it.
For example for some fields I use:

    @Override
    public boolean isEmpty() {
        String value = getValue();
        return value == null || value.trim().isEmpty();
    }

Perhaps a new addition to HasValue could be:

    public default boolean isEmpty(V value) {
        return Objects.equals(value, getEmptyValue());
    }

Which could then be easily pverriden.