[RSS Feed/News] if $xf.visitor.message_count|number} not working

[XenForo]

I have this code, and it never returns false. Why is that?

Code:

<xf:if is="{$xf.visitor.message_count|number} < 5">

        <xf:comment>Guests and members with less then 5 posts</xf:comment>

<xf:else />

                          

</xf:if>

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