The format you expected is still correct, although the document didn't say so, but ..., not just you can be cheated, even UNIVERSAL::isa can be cheated, try this: 
use IO::Socket::INET;

use strict;

my $socket = new IO::Socket::INET();
print $socket, "\n";
print "is INET\n" if UNIVERSAL::isa($socket, "IO::Socket::INET");
print "is Socket\n" if UNIVERSAL::isa($socket, "IO::Socket");
print "is IO\n" if UNIVERSAL::isa($socket, "IO");
print "is GLOB\n" if UNIVERSAL::isa($socket, "GLOB");
print "is HASH\n" if UNIVERSAL::isa($socket, "HASH");

$socket =~ s/GLOB/HASH/;
print "after s///\n";
print $socket, "\n";
print "is INET\n" if UNIVERSAL::isa($socket, "IO::Socket::INET");
print "is Socket\n" if UNIVERSAL::isa($socket, "IO::Socket");
print "is IO\n" if UNIVERSAL::isa($socket, "IO");
print "is GLOB\n" if UNIVERSAL::isa($socket, "GLOB");
print "is HASH\n" if UNIVERSAL::isa($socket, "HASH");

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In reply to Re: stringified references by pg
in thread stringified references by rir

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