return script.getPreferred().newSubtag();
case VARIANT:
Variant variant = getEnum();
return variant.getPreferred().newSubtag();
case EXTLANG:
Extlang extlang = getEnum();
return extlang.getPreferred().newSubtag();
case EXTENSION:
case GRANDFATHERED:
case PRIVATEUSE:
case SINGLETON:
default: