Content type HTML should be allowed inside of HTMLCOMMENT type. #136

With Latte 2.4 I've run into problems with blocks inside of (conditional) HTML comments.

Let's say, I have @layout.latte template like this:

<body>
  {include content}
  <!--[if IE]>
    {block onlyIE}{/block}
  <![endif]-->
</body>

If I override onlyIE block in a page template I get User Warning: Overridden block onlyIE with content type HTMLCOMMENT by incompatible type HTML.
Also, I get similar warning if I try to include a block: Including block onlyIE with content type HTML into incompatible type HTMLCOMMENT.

IMO, there isn't any reason this shouldn't be allowed. Is it?