Number format issue using assign statement

Hi - 
I am trying to do a calculation using an assign statement.  This is the
script:

<#assign total = 0/>
<#list 1..q_client_income_rental_address_max?number as i>
   <#assign var = "q_client_income_rental_income_${i}" />
   <#if var?eval?? && var?eval?number gt 0><#assign
total=total+var?eval?number/></#if>

   <#assign var = "q_client_income_rental_otherincome_${i}" />
   <#if var?eval?? && var?eval?number gt 0><#assign
total=total+var?eval?number/></#if>
</#list>
${total?c}

My intention is that the result number is unformatted, i.e. for computer
audience. But, this script always produces a formatted number.

What is interesting is that putting debug print statements inside the loop
actually produces an unformatted result:

<#assign total = 0/>
<#list 1..q_client_income_rental_address_max?number as i>
   <#assign var = "q_client_income_rental_income_${i}" />
   <#if var?eval?? && var?eval?number gt 0><#assign
total=total+var?eval?number/></#if>
    ${total?c}

   <#assign var = "q_client_income_rental_otherincome_${i}" />
   <#if var?eval?? && var?eval?number gt 0><#assign
total=total+var?eval?number/></#if>
    ${total?c}
</#list>
${total?c}

the result being
4000

    4250
4250

note that i = 1.

I have tried various syntax in the assign statements, with no luck.  Doing
something like

<#assign total= (total+var?eval?number)?c />

produces an error saying that total is a SimpleScalar; using total?number
didn't help either.

I'm rather confused about this now.  Am I doing something wrong?  Why are
the debug printouts actually producing my desired result?  I'm using FM
2.3.13.

Thanks for any ideas - 
Kent

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