Github user kaspersorensen commented on the pull request:
https://github.com/apache/metamodel/pull/13#issuecomment-87759734
Yes normally I would also be in favor of making a copy. But in this case it
is really a "reference" and not an independent item. So if you change that then
I think we can make the general change a lot less - then you don't need to make
the clone method public and you don't need to change the existing unittest.
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