The example is wrong, indeed -- iirc, the transformations were not returning `$null` in
the initial design, because they were supposed to be a property of a valid value. Not sure
if there is any transformation returning `$null` right now.
However, changing this behaviour might break other existing configs, so this has to be
discussed and analyzed properly.
Right now probably the `{s.count,;}` should be used to get what is the max index.
*
https://www.kamailio.org/wiki/cookbooks/5.3.x/transformations#scount_c
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