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[Submitted by Ricardo Signes] There is some contradiction in the docs: isa This method cannot be used to access a hash element 'isa', because Hash::AsObject doesn't attempt to handle it specially. can Similarly, this can't be used to access a hash element 'can'. Later: The methods can() and isa() are special, because they're defined in the UNIVERSAL class that all packages automatically inherit from. In Perl, you can usually use calls $object->isa('Foo') and $object->can('bar') and get the desired results, but you have the options to use UNIVERSAL::can() and UNIVERSAL::isa() directly instead. In Hash::AsObject, you must use the UNIVERSAL functions - unless, of course, you want to access hash elements 'can' and 'isa' Oops? [Submitted by Thomas Linden] Beside this your Copyright section dates the copyright to 2003, you should change this to 2003-2007 or something.