Sure, I will change it into series. Do you think it should be parametrized? 
Also I will add counter.
As it comes to synthetic step - well I decided that it's good example of ParDo 
operation. But I can write a test dedicated ParDo class/method if you think 
it's the better option.

[ Full content available at: https://github.com/apache/beam/pull/6239 ]
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