There's no code for this object system, you don't even have to install the module to use it.

An object is a hash, a method is a closure, and a class is a subroutine.

True private variable, not by pretending.

Multiple inheritance without the diamond problem.

Method dispatching takes zero time, in fact it is not needed at all.

The built-in mechanism of Perl 5 OO is completely bypassed.

If you want a bird you could inherit from a jungle and remove everything else so that it's the only thing left.

You don't need a package to change the inheritance of an object, you only need a single statement.

Inheritance of a class could be chosen at runtime, the inheritance of the objects of the same class could thus be different.

Easy creation of metaclass, metametaclass, etc.

I just released Dot, it's a new object system for Perl, some of its highlight and difference:You can see the full documentation on CPAN