~&gt; perl6 -e &quot;say(0.1 + 0.2)&quot;<p>0.3<p>~&gt; nqp -e &quot;say(0.1 + 0.2)&quot;<p>0.3<p>~&gt; perl6 -e &quot;say (0.1 + 0.2).WHAT&quot;<p>(Rat)<p><a href="http:&#x2F;&#x2F;doc.perl6.org&#x2F;type&#x2F;Rat" rel="nofollow">http:&#x2F;&#x2F;doc.perl6.org&#x2F;type&#x2F;Rat</a>