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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