Github user okram closed the pull request at:
https://github.com/apache/tinkerpop/pull/639
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GitHub user okram opened a pull request:
https://github.com/apache/tinkerpop/pull/639
TINKERPOP-1669: EdgeVertexStep should be designed for extension
https://issues.apache.org/jira/browse/TINKERPOP-1669
`EdgeVertexStep` is no longer final and can be extended by providers.