R Under development (unstable) (2024-01-28 r85838 ucrt) -- "Unsuffered Consequences"
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> library("R.rsp")
R.rsp v0.46.0 successfully loaded. See ?R.rsp for help.
> 
> x <- sqrt(2)
> strings <- c(character(0L), "", NA_character_, "Hello world!", "x={{x}}", "x^2={{x^2}}")
> 
> for (s in strings) {
+   print(s)
+   t <- wstring(s)
+   print(t)
+ }
[1] ""
[1] ""
[1] NA
[1] "NA"
[1] "Hello world!"
[1] "Hello world!"
[1] "x={{x}}"
[1] "x=1.4142135623731"
[1] "x^2={{x^2}}"
[1] "x^2=2"
> 
> t <- wstring(strings)
> print(t)
                                     NA        Hello world!             x={{x}} 
                 ""                "NA"      "Hello world!" "x=1.4142135623731" 
        x^2={{x^2}} 
            "x^2=2" 
> 
> proc.time()
   user  system elapsed 
   0.37    0.10    0.42