UNITS
UNITS = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB']
The units, largest last.
Renders a byte count in the largest unit that stays readable.
Every size in Strata is a byte count and most of them are large. A raw 4194304 in a table cell is
a number an operator has to decode; 4.0 MiB is one they can compare at a glance, which is the whole
job of a report.
Binary units, because these are stored bytes and every tool an operator will check them against - du, ls, the object store's own console - uses binary too. Provider billing uses decimal gigabytes and the estimator converts there; a table of stored sizes is not a bill.