Github user StephanEwen commented on the pull request: https://github.com/apache/flink/pull/1513#issuecomment-181511999 Is the switch from `ProcessingTime` to `PROCESSING_TIME` actually necessary? Breaks yet one more thing for users just because of a matter of taste. There are only so many breaking changes that we can do without upsetting people too much, and I would like to make those where it makes a difference.
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