The curious thing here on my end is that once Lightroom eats up all this space during a merge, it doesn't give it back to me after quitting Lightroom. The only way for me to get the space back is to restart my computer entirely (2013 MacBook Pro, 16GB RAM, macOS Mojave). I can't believe that this doesn't impact more people on a regular basis. Among Lightroom's zillion other problems, I'd say this is a pretty major one.
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