Github user srowen commented on the issue: https://github.com/apache/spark/pull/22179 Kryo 3.0.3 and Chill 0.8.2 already work with 2.12, so no issue particularly there. I don't see that this change would be visible to users, and tests suggest it doesn't affect Spark. I'm cautious that I'm maybe overlooking something though. And weighing the risk vs the upside of fixing some user issues and potential performance bumps.
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