whosgonna left a comment (kamailio/kamailio#4409)

I understand `$var()` and it's explicit difference from `$vn()`, so there's  no 
need to discuss that.  This is strictly about the `{sql.val.str}` and 
re-reading it's documentation, I see that it is doing what is is documented to 
do:

> Like sql.val, but output string '' for null values.

I will point out that this transformation is at best poorly named, and when 
compared to the (much better named, but similarly functioning aside from the 
quoting) `{val.ne}` it's confusing.  



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