It seems to me that if you're declaring an argument, you'd always specify a default, because you want that variable to be there.
No, you want the <cfargument> tag present so that if the argument is supplied, CF will still do type checking (and for documentation purposes):
<cfargument name="foo" type="numeric" required="false" />
<cfif structKeyExists(arguments,"foo")>
<!--- we know it is numeric --->
<cfelse>
<!--- argument foo was not supplied --->
</cfif>Regards, Sean
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