* Returns polygons that represent a Delaunay triangulation constructed
     * from a collection of points. Note that the triangulation doesn't compute
     * the intersections between lines; it takes only existing coordinates.

The javadoc here is exactly the same as for `ST_ConstrainedDelaunay`. 
But surely the two functions do different things? Need to update the javadoc for `ST_ConstrainedDelaunay`