Github user davies commented on the pull request:
https://github.com/apache/spark/pull/7965#issuecomment-128177333
@megatron-me-uk I think it's reasonable to change the `zeroValue` once you
provide a mutable function, for example, the builtin function `reduce` also
works in this way.
If we change to reply on `deepcopy`, it will not work in some cases (for
example, object from C extension).
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