Fix failing case of subtraction losing Units class - #61
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Currently, if you subtract a zero unit from another, it will revert to the scalar class, rather than maintain its Unit class. However for addition, it is still respected.
This fix caters for the loss of Units class when two zero Units are subtracted.
olbrich
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Jan 25, 2013
Fix failing case of subtraction losing Units class
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Currently if you subtract 2 Units that are zero, the result is not a Unit, but the scalar object. However if you add them, it respects the Units class correctly.
Here is the fix and 2 tests that prove it.