Github user dkuppitz commented on the issue:
https://github.com/apache/tinkerpop/pull/485
Because it's more complex then that. Example:
```
g.V().as("a").out().store("a").in().sideEffect(<access
"a">).groupCount().unfold().sideEffect(<access "a">)...
```
In the first access to "a" we expect to get intermediate result. The second
time we expect the final "a".
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