Using Underscore.js template within Knockout.js doesn't allow me to use "if" binding -

i want use unserscore.js template speed of code. referred following question.

using underscore template knockout using interpolate due asp.net

here working example link above,
http://jsfiddle.net/6pstz/433/

however, once include "if" binding inside template, gives me error saying "this template engine not support 'if' binding within templates ".

here example,
http://jsfiddle.net/6pstz/488/

<script type="text/html" id="peoplelist">     {{ _.each(people(), function(person) { }}         <li>             <b data-bind="text: person.name"></b> {{= person.age }} years old         </li>    {{ }) }}     <!-- if binding issue -->     <!-- ko if : test -->     <div data-bind="text:teststring">test</div>     <!-- /ko --> </script> 

please check console if on chrome, there should error. guess need tweak "if" binding underscoretemplateengine, i've no idea should do.

if binding uses knockout template engine, use underscore template instead

{{ if (test) { }}    <div data-bind="text:teststring">test</div> {{ } }} 

see fiddle