in src/main/java/org/apache/sling/jcr/repoinit/impl/AclUtil.java [623:637]
private Set<Privilege> expandPrivileges(Privilege[] privileges){
Set<Privilege> expandedSet = new HashSet<>();
if(privileges != null){
for(Privilege privilege : privileges){
if(privilege.isAggregate()){
expandedSet.addAll(Arrays.asList(privilege.getAggregatePrivileges()));
} else {
expandedSet.add(privilege);
}
}
}
return expandedSet;
}