Weaverbird mesh thicken option 'OffsetTypeEnum'

What is the option ‘OffsetTypeEnum’ used for?
offsettypeenum 01.gh (4.3 KB)

https://rhino.github.io/components/weaverbird/meshThicken.html

when you hover over component inputs it tells you a description. T = offset type. Each type has a description.

Thank you for your reply. I am familiar with the hover. However, I do not know how to use option 2 of the component.

What does the error say? That option is experimental and looks like it requires a valence 3 mesh as the description says. Means a mesh where each vertice connects 3 edges.
http://www.ams.org/publicoutreach/feature-column/fcarc-geometry-glossary

I just think option 2 doesn’t work. Not sure if it Rhino 6 or other thing ?