Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/898
`subgraph()` serialization is a major problem without a clear solution for
GLVs. there is nothing for anyone to deserialize a returned subgraph into for
GLVs and so it has no where to go. all you can do with a GLV is return a form
of edge list i guess and then reconstruct your graph on the client in
"something else" (whatever that is - perhaps an in-memory graph written in that
native language??). Not sure where to go there until TinkerPop gets in the
business of building Gremlin Virtual Machines in every language at which point
you'd have a `tinkergraph-js` and a `tinkergraph-python` and so on....
---
