(info "(coreutils) sleep invocation") Historical implementations of ‘sleep’ have required that NUMBER be an integer, and only accepted a single argument without a suffix. However, GNU ‘sleep’ accepts arbitrary floating point numbers. *Note Floating point::.
Add: *GNU sleep will pass that floating number to the system, which might or might not ignore the time indicated after the decimal point. OR *GNU sleep will round / truncate? the number into a whole number, before sending it to the system.
