Add a bullet point about meaning of Num

diff --git a/moose-class/slides/index.html b/moose-class/slides/index.html
index b3fc141..6422804 100644 (file)
--- a/moose-class/slides/index.html
+++ b/moose-class/slides/index.html
@@ -2631,6 +2631,7 @@ undef</code></pre>
   <ul>
     <li><code>Value</code> is true when <code>! ref $thing</code></li>
     <li><code>Value</code> and <code>Str</code> are effectively the same, but <code>Str</code> is more expressive</li>
+    <li><code>Num</code> is true when a <code>$scalar</code> looks like a number</li>
     <li>An overloaded object which numifies does not pass the <code>Num</code> constraint!</li>
     <li>Perl 5's overloading is hopelessly broken</li>
   </ul>