Again I don't understand what is the problem? `CoProcessOperator` doesn't 
contain any logic besides wrapping/proxying to user function. Also what do you 
mean by:
>  this class uses a lot of internal code.

Regular `CoProcessFunction` and `CoProcessOperator` have fixed (different) 
semantic of what even time is set on emitted results when processing timers 
(check usage of `collector.setAbsoluteTimestamp` in this class compared to 
`KeyedCoProcessOperator`).

[ Full content available at: https://github.com/apache/flink/pull/6776 ]
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