Fix a broken unit test (#3) #4
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This can happen when finish and start are 0, and step is -1. Length should be 0, but is calculated as -0. This is strange behavior, and caused a unit test to fail because the generated array length was 0, which did not assert as equal to the calculated range length or -0.
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Ensures length is not negative. This can happen when finish and start are 0, and step is -1. Length should be 0, but is calculated as -0.
This is strange behavior, and also caused a unit test to fail because the generated array length was 0, which
did not assert as equal to the calculated range length or -0.
Fixes issue #3.