eep(1): comment why u64 number
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				@ -36,7 +36,7 @@ fn main() -> ExitCode {
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	if argv.len() == 2 {
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		if let Ok(s) = argv[1].parse::<u64>() {
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			sleep(Duration::from_secs(s));
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			sleep(Duration::from_secs(s)); /* from_secs needs u64 */
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			ExitCode::SUCCESS
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		} else {
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			usage(&argv[0])
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