Github user okram commented on the issue:
https://github.com/apache/tinkerpop/pull/446
Hm. This is a hard pill to swallow as its not backwards compatible. I was
thinking you were going to go the route of making it `Map<Object,Object>` and
thus, allow the enums as they are. If people have code that is `map.get(id)`,
your changes will break their code.
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