>What are the other problems exactly? This does sound like the right approach 
>to me.

Ok, the issue was the numpy bool data, which is 1-byte, needs to be converted 
to a new bitmap before any casting is done.  This also fixes when converting 
from Numpy bools to other numbers.  @pitrou and @wesm please take a look when 
you can, thanks!

[ Full content available at: https://github.com/apache/arrow/pull/2698 ]
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