Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/705
hmm - and then a TinkerGraph strategy that converts `g.V().drop()` to a
`clear()` operation somehow (to avoid overhead of iterating all the vertices?
by that logic is `clone()` really `g.E().subgraph('sg').cap('sg')`?
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