Robert Nishihara resolved ARROW-2451.
       Resolution: Fixed
    Fix Version/s: JS-0.4.0

Issue resolved by pull request 1887

> Handle more dtypes efficiently in custom numpy array serializer.
> ----------------------------------------------------------------
>                 Key: ARROW-2451
>                 URL: https://issues.apache.org/jira/browse/ARROW-2451
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Robert Nishihara
>            Assignee: Robert Nishihara
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: JS-0.4.0
> Right now certain dtypes like bool or fixed length strings are serialized as 
> lists, which is inefficient. We can handle these more efficiently by casting 
> them to uint8 and saving the original dtype as additional data.

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