typedef int PK_reset_prec_t;
This datatype indicates the success of an attempt to reset the precision of
an edge to the session precision.
One of the following values:
   PK_reset_prec_ok_c             geometry successfully replaced and precision
                                  set to session precision
   PK_reset_prec_tangent_c        geometry not replaced and precision
                                  unaltered because surfaces are approximately
                                  tangential at edge
   PK_reset_prec_missing_geom_c   not enough geometry present on edge or
                                  adjacent faces to recompute edge geometry
   PK_reset_prec_failure_c        recomputation of edge geometry failed.