 not-a-number value propagates. If an argument to a real-valued
function is not-a-number, it either rejects (an exception in the
underlying C++) or returns not-a-number itself. For boolean-valued
comparison operators, if one of the arguments is not-a-number, the
return value is always zero (i.e., false).</p>
</div>
<div id="infinite-values" class="section level4 unnumbered">
<h4>Infinite values</h4>
<p>Positive infinity is greater than all numbers other than itself and
not-a-number; negative infinity is sim