NULevelDB
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Xcode 4.5 complains that the key does not conform to NSCopying
This is with reference to https://github.com/nulayer/NULevelDB/blob/master/Classes/NULDBDB%2BEnumeration.mm#L140.
Xcode 4.5 raises an issue instead of a warning.
Same for me fixed by casting key to NSCopying protocol, which of course not perfect solution.