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Bryan CutlerWes McKinney
3b61349b3c1
Bryan Cutler authored and Wes McKinney committed 2b361fb2e5b
ARROW-3428: [Python] Fix from_pandas conversion from float to bool

When `from_pandas` converts data to boolean, the values are read into a `uint8_t` and then checked. When the values are floating point numbers, not all bits are checked which can cause incorrect results.

Author: Bryan Cutler <cutlerb@gmail.com>

Closes #2698 from BryanCutler/python-from_pandas-float-to-bool-ARROW-3428 and squashes the following commits:

f3d472626 <Bryan Cutler> added test with fix that passes, but fails other tests