Namaste,Although it might look strange to argue with Harry, whose book Schrift im alten Indien: Ein Forschungsbericht mit Anmerkungen is one of my reference books,
. So "he had the type of r over v but not the type r over the long a" seems wrong, because in the same Jataka-mala volume on the same page and line we see, that the r over long a can be set in different combinations.
Mārcis Gasūns