Using the circle below as an example. I would like to close the gap, doesn't really matter if it is by snapping or adding a vertice. I have tried both Snapper and LineCloser, but they don't seem to work when there is only one geometry.

How can I connect the start and end points in the example below? I would rather not use the LineCloser of fear of self intersections (real world features are more complex than my example), and the HullReplacer is to slow.