How to cast a parameter from ${bindings.myParam} which is Number to String

I have a button which sets a param in request so I do sth like this in event on uix page:
<set property="param_id" target="${requestScope}" value="${bindings.myParam.attributeValue} "/>
but that myParam is Number (not String). And I have java.lang cast exception.
What should I do to cast it?

I'm sure there is a simpler way but i guess this works:
<bean:define id="num" name="bindings" property="myParam.attributeValue" type="Number"/>
<set property="param_id" target="${requestScope}" value="<%num.tostring()%>"/>This is not tested! One other thing to check is JSTL FMT formatNumber but i don't remember the syntax.

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