How to access class constants in Twig?

Question

I have a few class constants in my entity class, e.g.:

class Entity {
    const TYPE_PERSON = 0;
    const TYPE_COMPANY = 1;
}

In normal PH

Answer 1

As of 1.12.1 you can read constants from object instances as well:

{% if var == constant('TYPE_PERSON', entity)