QLocale::OldHungarianScript has no matching locale

Old Hungarian (also known as Rovás or Hungarian Runic, ISO 15924: Hung) is a writing system actively used by some Hungarian communities (wikipedia). Therefore I would expect it to be usable with QLocale objects, or be able to create a translation using this alphabet.

Unfortunately, QLocale supports neither at the moment. If I try to use OldHungarian as the script parameter of QLocale's contructor, it defaults for the current locale. The same happens with using the QString-based ctor (using eg. "hu_Hung_HU"), and as such I can't use QTranslator's relevant function either. QLocale::matchingLocales also returns an empty list if I try to use OldHungarian as the script parameter, and only returns the Latin variant if I query for Hungarian/Hungary.

A small test program is attached for testing matchingLocales. The expected output would be:

hu_...._..: (QLocale(Hungarian, Latin, Hungary), QLocale(Hungarian, OldHungarian, Hungary))
.._Hung_..: (QLocale(Hungarian, OldHungarian, Hungary))
.._...._HU: (QLocale(Hungarian, Latin, Hungary), QLocale(Hungarian, OldHungarian, Hungary))

hu_Hung_..: (QLocale(Hungarian, OldHungarian, Hungary))
hu_...._HU: (QLocale(Hungarian, Latin, Hungary), QLocale(Hungarian, OldHungarian, Hungary))
.._Hung_HU: (QLocale(Hungarian, OldHungarian, Hungary))

hu_Hung_HU: (QLocale(Hungarian, OldHungarian, Hungary))

The current output is:

hu_...._..:  (QLocale(Hungarian, Latin, Hungary))
.._Hung_..:  ()
.._...._HU:  (QLocale(Hungarian, Latin, Hungary))

hu_Hung_..:  ()
hu_...._HU:  (QLocale(Hungarian, Latin, Hungary))
.._Hung_HU:  ()

hu_Hung_HU:  ()