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$ perl -wMstrict -MDevel::Peek -le 'my $x = undef; Dump( $x )'
$ perl -wMstrict -MDevel::Peek -le 'my $x = !1; Dump( $x )'
$ perl -wMstrict -MDevel::Peek -le 'my $x = defined(undef); Dump( $x )
+'