[perl #128468] Using negative exit code should probably be forbidden (exit -99999)

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# New Ticket Created by  Alex Jakimenko 
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exit -99999     # exit code is 97
exit -999999    # exit code is 193
exit -999999999 # exit code is 1
exit -99999999  # exit code is 1

I think that only non-negative numbers should be allowed.