Github user JPMoresmau commented on the issue:
https://github.com/apache/tinkerpop/pull/446
What? I'm just saying that currently valueMap returns `Map<String,Object>`,
so if you iterate on all the keys as String, you get a runtime crash because
there are keys that are not strings. So if you don't want to put only String as
keys, you need to change the Map to `Map<Object,Object>` , which will also
break existing code.
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