将数字格式化为十进制（1000是1.0k）和IEC（1024是1.0ki），直到YOTTA后缀。

示例

use pakr_iec::*;
assert_eq!("1.0", decimal(1));
assert_eq!("1.0", iec(1));
assert_eq!("1.0k", decimal(1000));
assert_eq!("1.0ki", iec(1024));
assert_eq!("10.0M", decimal(10_000_000));
assert_eq!("10.0Mi", iec(10 * 1024 * 1024));
assert_eq!("1.0Y", decimal(1_000_000_000_000_000_000_000_000_u128));
assert_eq!("1.0Yi", iec(1_208_925_819_614_629_174_706_176_u128));