ActionView::Helpers::SanitizeHelper.sanitize docs

Hello,

First sentence of sanitize() method doc says: "This sanitize helper
will html encode all tags and strip all attributes that aren't
specifically allowed."

But sanitize("<h1>foo</h1> <bar>should html encode</bar>") ==
"<h1>foo</h1> should html encode".
Shouldn't it html encode <bar> to &lt;bar&gt; ?