Mathematica: Compile won't work with a Quantity with units

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The example shows Compile failing with UnitConvert, but it also fails with anything that returns a Quantity, which is not very useful if you have a units-aware library. The only way to get around it is to pre-scale all Quantity arguments in a wrapper, delegate to a compiled function that does not use Quantity, and then scale the result on the way back out, which defeats the entire purpose.

This limitation is a great shame given how useful the MMA Quantity system is.

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