Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1706#issuecomment-188448934
I want to add this because it enables triggers that can essentially discard
late elements. It does not change any previous behavior but just enables some
nifty custom trigger tricks.
I don't want to add big changes to the Triggers themselves this short
before the release, that's why I'm only suggesting to add this small change.
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