4.5.5p2 feature - how to disable collider detection overlapping start of 2D ray cast?

Unity Engine
1

Like the sound of this feature in 4.5.5p2 -

(640200) - Physics2D: Provide option to turn on/off the ability to detect a collider that overlaps the start of any 2D line/ray cast

Given many rays originate from within a body with a 2D collider, this should prove much more workable than moving objects in and out of IgnoreRaycast layers. But how does one enable it?!

2

Bump. Do new features not get any documentation? How is one supposed to use them then?! “Here’s a great new feature but we’re not going to tell you how to use it!” :face_with_spiral_eyes: