Github user willb commented on the pull request:
https://github.com/apache/spark/pull/189#issuecomment-39610852
So I just added this to `ClosureCleanerSuite` and I'm not seeing the same
behavior. (I already had added a captured-field test to
`ClosureCleanerSuite`.) I don't have a test that depends on deep copying of
referenced objects with mutable state, though; all of my tests have objects
with mutable state that is of JVM primitive types.
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