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I think it's equivalent of some when price goes up 100% it only needs to drop by 50% to get to the same value. That is, multiply by 2 and divide by 2 "don't yield the same result". If that makes sense. :-)
I think I see what you are hinting at. But I don't think it's related. Here, it is really just because one should not use the same variable for the two cases, as they are different. See #823807.
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