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The error is curious because it's not saying that it doesn't understand the command "leep" it's saying the number is invalid. I've checked on my Linux desktop and that's the same error I get out of busybox's sleep if I give it a non-numeric. So it seems the "s" is not being eaten so much as not displayed.
Doesn't explain why it's not accepting 3 and 10 as numbers though.
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