Another related issue is that, unless you push books using wireless transfers, we consume calibre files as is, with a bunch of metadata we don't care and we don't use.
In wireless transfers we just discard these fields before writting the file, so the json ends up being much more slim.
The difference isn't too much for calibre beginners (up to 10x) but grows a lot if you're one of those advanced users with toons of custom metadata.
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