Flags to modify the format of the string returned by.
behave the same as
include the exact number of bytes as part of the returned string. For example, "45.6 kB (45,612 bytes)".
use IEC (base 1024) units with "KiB"-style suffixes. IEC units should only be used for reporting things with a strong "power of 2" basis, like RAM sizes or RAID stripe sizes. Network and storage sizes should be reported in the normal SI units.