&gt; And it has to be a language feature in Perl 6 as there you don&#x27;t have open classes as in Ruby or an equivalent feature for overriding operators or adding functionality to standard lib types.<p>I&#x27;m not sure what makes you think this. I&#x27;m not very familiar with Ruby&#x27;s internals but Perl 6&#x27;s MOP certainly supports modifying classes, you can add your own operators etc.<p>Could you provide a more explicit example?