Tessellator has support from Steiner points which come from the original porting of the MapBox's earcut algorithm to Java. We are not using such points and therefore it would be better to remove it.
In addition, it actually introduces a bug when a polygon hole is a line with al coplanar points. In some cases it can be reduced to a point and then treated as a Steiner points. This looks to be wrong and on those cases we should throw an error.