gwynne/MAKVONotificationCenter — comment on commit 9db3c4de967796470fc5e043e4642a2973757d47
File: MAKVONotificationCenter.m line 221
By mikeash:

I'm a little torn with tracking swizzled classes in an ivar, since swizzled-ness is a global property. Presumably one would never use more than one `MAKVONotificationCenter`, but it's not actually a singleton, so it would be good to cover that case, even if it should never really happen. I'd suggest moving it to a global variable. Access to it should also be synchronized for thread safety.