f:param not passed / Uncaught ReferenceError: myfaces is not defined

<h:form>
<h:commandButton id = "submit"
value = "Show Message">
<f:param name = "test_name" value = "test_value" />
</h:commandButton>
...

produces the following html:

<form id="j_id_3" name="j_id_3" method="post" action="/test/home.xhtml?jfwid=-x7udcvg7i" enctype="application/x-www-form-urlencoded">
<input id="j_id_3:submit" name="j_id_3:submit" type="submit" value="Show Message" onclick="return myfaces.oam.submitForm('j_id_3','j_id_3:submit',null,[['username','JSF 2.0 User']]);">

The  onclick="return myfaces.oam.." causes an error as the myfaces variable hasn't been defined.

I compared the working 3.0 case to the failing 4.0 case, and I have a fix by backporting some removed code (minus the IE support) . However, I know there's been JavaScript discussion, so feel free post another fix if there's better way.