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  1. or download this
        $var = ($type)SvPV_nolen($arg)
  2. or download this
        if (SvOK($arg)) 
       $var = ($type)SvPV_nolen($arg);
    else
       $var = INT2PTR($type,SvIV($arg))
  3. or download this
    INPUT

...
       $var = ($type)SvPV_nolen($arg);
    else
       $var = INT2PTR($type,SvIV($arg))
  4. or download this
    use strict;
use warnings;
...

my $z = foo('');
Dump $z;