To many relationships probably should have been implemented as
NSSet not NSArray. Properly they are sets and using NSArray
deludes people into thinking it really is an ordered list. I'd
guess that they used NSArray to avoid the NSSet overhead of
verifying that an object is not in the set before adding it.
Almost all of EOF and WO should be NSSet instead of NSArray. The
vast majority of API that returns an array doesn't really mean it.
If you look at the EOF model stack impl in WOLips, you'll notice it's
all Set, and it makes the API a lot more clear.
ms
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