Github user jorgebay 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>>`.
For that, we should expose an async `TraversalStrategy` interface
containing a `applyAsync()` method that returns a completable future.
A fully async API could be translate to any language, even for the ones
that don't feature thread pools (like JavaScript).
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