What's the order of the points in a PolygonCollider2D?

Trying to get the outside boundaries of a group of connected sprites based on their respective PolygonColliders2D. I’m pretty close but I’ve been fiddling so much with it that I’ve started to confuse myself. How are points in a PolygonCollider ordered? clockwise from top left?

There’s no defined order, aside from what you decide on yourself if you set them in code using PolygonCollider2D.SetPath(). Also there can be multiple paths in one collider.