[kevin9327]

human_readable_number prints one decimal place for sizes under 10 units and none from 10 up. The < 10 check uses integer division, but the decimal branch rounds with {:.1}, so a size from 9.95 to 9.99 units passes the check and then rounds up to 10.0:

human_readable_number(10239, "")   -> "10.0Ki"   (10240 gives "10Ki")
human_readable_number(9999, "si")  -> "10.0K"    (10000 gives "10K")

The same happens at every unit (10.0Mi, 10.0G, ...). Those sizes now print as 10Ki / 10K, the same as the sizes just above them. Everything else is unchanged.

Tests: new cases in test_human_readable_number_si fail before the change (left: "10.0Ki", right: "10Ki") and pass after; cargo test (all suites) and cargo fmt --check pass.

AI assistance: I used an AI coding assistant to help find and write this change. I reviewed the code and tests and ran them myself.

[bootandy]

that is an interesting edge case. thanks!