UINibUnarchiver.mm
pObj->cachedId = [classId alloc];

alloc without init is considered invalid, and the way constructObject() is currently written may leave pObj->cachedId as an invalid object (this would be the case with any of our bridged classes, where alloc alone would return just our prototype object)

Additionally, not all classes respond to [[class alloc] init]. (eg: [[UIFont alloc] init] crashes on the reference platform, and our new implementation on the CT-DW branch also does not respect alloc->init)

I ran into this issue with UIFont specifically, so I left a quick special-case there for it on CT-DW to unblock myself, but someone should take a look at this and make a proper fix for it.