Github user mbroecheler commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/58#issuecomment-98239610
Yes, the only downside to return 0 is that you cannot differentiate between
a true 0 and "there isn't a count". However, in most cases where you are
counting stuff, you don't need to differentiate that. What would be the use
case for "has this count actually been set" in metrics?
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