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$ perl -wMstrict -le 'my $x=""; print 3+$x;' Argument "" isn't numeric in addition (+) at -e line 1. ... 3 $ perl -wMstrict -le 'my $x=defined(); print 3+$x;' 3
$ perl -MDevel::Peek -e 'my $x=undef; Dump($x)' SV = NULL(0x0) at 0x25ea5f8 ... PV = 0x3f6a860 ""\0 CUR = 0 LEN = 10