Github user newkek commented on the issue:
https://github.com/apache/tinkerpop/pull/386
A remark: @okram requested `TraversalExplanation` to be included in the
list of Graph objects. I've noticed that the current `TraversalExplanation`
Graphson serializer serializes a `Traversal`. In order to follow the
requirement of this GraphSON2.0 type system, we would have to write a
deserializer for the `TraversalExplanation` (there isn't currently). However,
the current 1.0 serializer serializes the Traversal as the `toString()` of the
Traversal's step list, which means that it is not possible to deserialize to a
Traversal with only such info. So I believe it would be more appropriate to
wait for TP1278 before implementing the `TraversalExplanation` ser/de and leave
it out of the scope of this PR.
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