|Subject:||There's no RV svtype|
Issue #1: The inheritance graph at the start of the document for 12 and 14 show SVt_RV, but it was removed in 5.12. Issue #2: I'm not sure why the historical and future values of svtypes (6, 8, 10 and 14 but not 12) are included in each of 8, 10, 12, 14. I think they should be removed. If not, then the values for 12 should be added.