Option to prevent simplification for simple polygons

[bylee20]

For instance, sometimes geojson-vt-cpp simplifies a very thin rectangle polygon to a sharp triangle.
Although a thin rectangle and a sharp triangle are similar in area and direction, the reduced vertex in such simple polygon shows noticeable change in human eye.

I think some option to prevent simplification for simple polygons would be useful.
For instance, with an integer n, geojson-vt-cpp would not simplify a geometry whose vertex count is less than n.