Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/748
oh....`filter(false)` referred to adding a `FilterStep` to the end of the
traversal basically that didn't allow any traversers through. Of course, a
provider writing a `TraversalStrategy` wouldn't be able to detect "false" if
you use the a lambda in `filter()`, so the provider couldn't optimize properly.
Are you thinking something else here?---
