Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/812
The local cache is specific to the `GraphTraversalSource` that's passed
into the `of()` construction method. As the `GraphTraversalSource` is specific
to the instance and is not known until construction I figured it was better if
it were managed local to the `JavaTranslator` instance---
