event link parameters is very sensitive

t:parameters="prop:{'pageNum':'indexValue'}" 
this compiles and runs but doesnt give me what i want


t:parameters="prop:{'pageNum':'2'}" 
this compiles and runs but doesnt give me what i want



t:parameters="prop:{'pageNum':'${pageIndex} + 2'}" 
t:parameters="prop:{'pageNum':'${pageIndex}'}" 
t:parameters="prop:{'pageNum':'${pageIndex+2}'}" 
this is what i want to try (and want) but it doesnt compile or run and 
complains about coercian to Map

all I want to do is send a pageNum parameter into my event handler

:(
                                          

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