Each use of a string literal requires creating a new string value.
PROBLEM CASE:
``` fn test = append "A" "B" test() --returns "AB" test() --returns "ABB"
```
TEST CASE:
``` fn test6 v = ()
```
FOR 100,000 ITERATIONS:
``` test6 "A" -- 125 msec. test6 #a -- 16 msec.
```
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