According to https://www.kamailio.org/wiki/cookbooks/5.1.x/transformations (and 
I'm using 5.1), I should be able to do something like 
`$var(num)=$(fU{s.substr,-1,10})` and `$var(num)` should be `123456789` if 
`$fU` is `0123456789` (only the last 10 characters are displayed).  However, 
`$var(num)` ends up with only the last character of the substring, in this 
case, `9`.

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