Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/450
ha +1 for a promise style api - i just wrote the exact same suggestion for
the java side:
https://issues.apache.org/jira/browse/TINKERPOP-1490?focusedCommentId=15557840&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15557840
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