Need explanation. Rounded rectangle, Even domain.

Created by: satabol

Windows 11, Blender 3.3.1, Sverchok master.

In docs of Rounded Rectangle says: http://nortikin.github.io/sverchok/docs/nodes/curve/rounded_rectangle.html#parameters

If "Even Domain is On" no length 1:

if "Even Domain is Off" then expect a couple of domain:

https://gist.github.com/a9992a9b46ec7d5a0b1f29f1535c79f3

I do not understand what I have to see?