Artifact 8ff55bf218d58db0795fd804464b9980ecf3530f37f7d257f9e3c8f12bb0d42a:
It is still implemented by all classes implementing OFCollection so far,
but new classes are not required to implement it anymore.
This is required to add OFCountedSet later, which can't support it. by js on 2011-07-17 16:38:47.
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