Function pretty_bytes_signed_binary 

pub fn pretty_bytes_signed_binary(
    num: i64,
    round_places: Option<u8>,
) -> PrettyBytesBinary

Convert a byte value to a “prettified” version, but accepts negative numbers

Converts using base-2 byte suffixes (KiB, MiB, GiB)

Example

let prettified = pretty_bytes_signed_binary(-1_048_576, None);
assert_eq!(prettified.to_string(), "-1 MiB");