subdividedCube function
A cube, twice Catmull-Clark subdivided.
mesh-45's own acceptance is one level's vertex and face count; two
levels is what a person actually turns on to round a box off, and is
dense enough that a missing crease or an inverted quad reads as a visible
dent rather than a number one level off.
Implementation
EditMesh subdividedCube() => catmullClark(EditMesh.cuboid(), levels: 2);