Not really, but the following does: 
$ perl -MData::Dumper -e'print Dumper sub{return 1 if $_[0]}->(undef)'
$VAR1 = undef;

$ perl -MData::Dumper -e'print Dumper sub{return 1 if $_[0]}->(0    )'
$VAR1 = 0;

$ perl -MData::Dumper -e'print Dumper sub{return 1 if $_[0]}->("0"  )'
$VAR1 = '0';

$ perl -MData::Dumper -e'print Dumper sub{return 1 if $_[0]}->(""   )'
$VAR1 = '';

[download]

Update: Switched to DD to show the difference between string zero and numerical zero.

In reply to Re^3: return if 0 by ikegami
in thread return if 0 by zigdon

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