http://www.perlmonks.org?node_id=125458


in reply to Hash Keys (strings or numbers?)

Leading zero's can turn octal on you:
$ perl -lwe 'print shift() + 4' 012
16
$ perl -lwe 'print 012 + 4'
14
$ perl -lwe'print "012" + 4' 
16
$

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In Section Tutorials