Github user PommeVerte commented on the issue:
https://github.com/apache/tinkerpop/pull/390
Is the difference in behavior on `Tree` between both of you because of some
lingering older version of jackson (shaded) in your local maven repo? Thought
this should have been fixed a while back and travis hasn't been chocking so far?
Also, are we certain `Tree<? extends Element>` is going to fit all needs? I
don't have much visibility here, dunno how this plays into other
implementations.
Cheers.
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