Oddly enough, the $wheel < 0
may be unnecessary even if it does aid in clarification.
Only in the case of the odometer 'turning over' will $wheel go negative. When $wheel is -1, $odometer[ $wheel ] will be the same as $odometer[ $#odometer ], which will have already been set to 0.
... of course relying on this in your code will piss off your maintainers.
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