how exactly is a closed polygon represented in Clipper2?

[LoreleiPup]

Hello, In my application I have only closed polygons, so I would like to input them to clipper2 as closed.
However, it's not clear exactly how a closed polygon is represented in Clipper2.
Is there a mathematical definition other than just that the first and final vertex are equal?
It seems that in all the clipper2 examples (such as the one below), the first and final polygon vertices in the input polygons are not equal.
http://www.angusj.com/clipper2/Docs/Units/Clipper.Engine/Classes/PolyTree64/_Body.htm
Thanks!

[reunanen]

There are separate methods for adding closed and open subjects, for example.

Does that help?

If not, can you elaborate a bit on what exactly you are trying to do?

[LoreleiPup]

I see now--thanks!