Robert Nishihara created ARROW-2451:

             Summary: Handle more dtypes efficiently in custom numpy array 
                 Key: ARROW-2451
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Robert Nishihara

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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