The groups, by smallest id, each ascending.
Groups of two or more coincident vertices.
Degenerate triangles (repeated vertex or near-zero area).
Triangles repeating the vertex set of a triangle with a smaller id.
Those edges as [min, max], ascending.
Edges with three or more triangles.
Interior edges used in the same direction by both their triangles.
Vertices whose triangle fan splits into several pieces.
Whether two triangles sharing no vertex intersect; null when not checked.
The defects of a mesh, from Scene.analyze. Lists with a count beside them keep their first
maxListedentries; counts are exact.