Just ran into this when doing some API stuff, it returned different values than the actual package settings.
If you set 10GB as package limit for disk size, the API returns 1010001000*1000 bytes -> 9.31GB instead of 10GB. When I switch to base 1000, instead of base 1024, it matches up exactly.
Isn't that the wrong way of accounting data?
Doesn't matter much for kilobytes, it's like 2.4% off, but 4.9% for megabyte, 7.4% for gigabyte and 10% off for terabytes....