Github user leifurhauks commented on the issue:
https://github.com/apache/tinkerpop/pull/340
@okram , I realized the current implementation of bindings as dicts is
breaking 2/3 compatibility. It also makes it bit hairy to extract just the key
in `RawExpression`.
I would suggest using a tuple (e.g. `('symbol', value)` ) or a simple class
that just has two data members. May I revise the bindings implementation?
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