Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/952#issuecomment-127144567
The earlier version had the Unmodifiable Config not as a subclass, which is
crucial. Adding into the config is probably good enough, no need to over
optimize this, I guess.
The assumption that mutating methods start with "set" or "add" is fair,
IMHO.
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