Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/478
> I think that, instead of doing blocking calls like fn.apply() on a thread
pool, we could expose a fully async API. Something like toListAsync() that
returns a CompletableFuture<List<T>>.
Could you please clarify a bit - What makes `toListAsync()` more "fully
async" compared to `promise(traversal::toList)`? Internally, from a Java
perspective anyway, `toListAsync()` does the same thing, doesn't it?
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