Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/5295
Yes, that was me. ð
It was just a quick idea, and it would work because
both `withGap()` and `withGapExtractor()` are static so the latter could have
`T` on the method signature and return a `DynamicEventTimeSessionWindows` (or
some such). I'm not against keeping it in the separate class, though.
I agree that the cast is a bit wonky but we know that it always works
because the trigger we return never looks at the element.
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