Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/356#issuecomment-40107316
This is why it would be good to add a test actually. For instance you can
add a test with
`_deserialize_double_vector(_serialize_double_vector(array([1,2,3]))` and check
that it returns `array([1.0,2.0,3.0])`.
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