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  1. The decoder does not seem to correctly decode the MakerNote and UserComment fields in the exif object, so I just delete them so that we do not have a bunch of un-decoded bytes wasting space in the JSON.

  2. The GPSTimeStamp array is important, because this is the time stamp of the moment the phone got the actual GPS coordinate that is associated with the image. This is often not the same point in time that the picture itself was taken. This is particularly true with my phone which does not have a very reliable GPS unit.

  3. The test directory is not unit tests, however, it does create json that you can look at to see if you find reasonable results. This should be refactored to produce unit tests.