Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/189#issuecomment-39612630
Oh never mind, I see that `ensureSerializable` *is* actually cloning it. I
had misunderstood (partly due to its name) and thought it was returning the
original function. In that case the PR is doing the right thing, but perhaps we
can improve the explanation and names.
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