Immediate.Validations conditional validators and delegates

Trying to reimplement some of my FluentValidation rules in IV and a lot of my rules depend on

.When()

.When()

and

Must()

Must()

. I see that

AdditionalValidators

AdditionalValidators

is something I can define but the example in the docs makes it look like a lot of boilerplate in comparison

Immediate.Validations conditional validators and delegates - C#