Github user mpetruska commented on the issue:
https://github.com/apache/spark/pull/19846
@HyukjinKwon : Hi, yes: this is the "retrofitting" of the original bug fix,
which never made it to Scala 2.11. Instead of copy-pasting the original
discussion, let me link the [original
PR](https://github.com/scala/scala/pull/5640).
I can add more details about specific parts, of course.
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