Thanks to the work for HV-1497 Closed , done by @Marko Bekhta and @Guillaume Smet, we now have a HibernateConstraintValidator which provides us an initialize method that also takes a HibernateConstraintValidatorInitializationContext argument.

Which btw is great and I was waiting for something like this for years
Why?
Because, that addition allows us to easily pass a dynamic payload to each new instance of a `HibernateConstraintValidator` - which for us was a major pain so far to do. Right now we could only get a static payload from the annotation. But now we could pass a dynamic payload each time we call `validator.validate()`. E.g. in almost all applications we use HV we need to know the language or country of a user for the validation process - think of zip codes which differ for each country. With the current architecture of BV / HV this is basically impossible to achieve. That's why we used hacks like put the language / country (the "payload") into a ThreadLocal and retrieve the "payload" from that ThreadLocal inside the isValid method of a ConstraintValidator.

That's why I propose following addition the Hibernate Validator:

someValidator
    .unwrap(ValidatorImpl.class)
    .withDynamicConstraintValidatorInitializationPayload(payloadObject)
    .validate(objectToValidate)

Inside a HibernateConstraintValidator we can retrieve that payload like this:

public class MyFutureValidator implements HibernateConstraintValidator<MyFuture, Instant> {

	private SomeType dynamicPayload;

	@Override
	public void initialize(ConstraintDescriptor<MyFuture> constraintDescriptor,
			HibernateConstraintValidatorInitializationContext initializationContext) {
		this.dynamicPayload = initializationContext..getDynamicPayload(SomeType.class);
	}

	@Override
	public boolean isValid(Instant instant, ConstraintValidatorContext constraintContext) {
		// Here I can use the dynamic payload now
		dynamicPayload.getSomeData();
		//...
	}
}

This withDynamicConstraintValidatorInitializationPayload / getDynamicPayload approach is the same we already use to pass a Dynamic payload as part of ConstraintViolation:
https://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/#section-dynamic-payload