Github user okram commented on the issue:
https://github.com/apache/tinkerpop/pull/448
@aholmberg We have had a distinction between reader/writer since the
beginning of TinkerPop. I believe (@spmallette knows more) that there is a
`GryoMapper` class that has all the serializers registered. Thus, both reader
and writer have reference to a `GryoMapper`.
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