Github user okram commented on the issue:
https://github.com/apache/tinkerpop/pull/486
`PathProcessors` are intended for path analysis steps that use
`by()`-modulation. Also, what about `CyclicPathStep`? Perhaps just itemize
those steps explictly for now and now have them implement `PathProcessor`.
However...I guess they are `PathProcessors` that don't project out...
hmmm... perhaps do a study of `PathProcessor` use and see if making
`SimplePathStep` and `CyclicPathStep` one of those would be a problem.
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