Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/685#issuecomment-43177180
Yes, it is unmaintained but it also means that it won't change in the
future, less likely than Guava. I'm actually okay to switch to JSON by
replacing `(` and `)` by `[` and `]`, respectively. Which format do you prefer?
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