setApplicationFallbackFontFamilies could be more convenient

The new QFontDatabase::setApplicationFallbackFontFamilies is a great addition, I have a font file which contains mostly icons, and want them to be applied to any script.

The only way to achieve this is to apply setApplicationFallbackFontFamilies on each script.

I would like to be able to use the default system font for and use my custom font on top of it, for any script.

If I do:

QFontDatabase::setApplicationFallbackFontFamilies(QChar::Script_Common, families);

I see in the console:

qt.text.font.db: Invalid script passed to setApplicationFallbackFontFamilies: 2