Yeah. I should have been more clear. I meant as the default. There are all kinds of nice optimizations that can be done with immutable strings compared to mutable ones. Which I probably don't have to tell you, Gustavo :) I have been reading every patch you have made to chez, not understanding half of it but loving every moment.
> immutable strings (which racket has not)
The reader makes strings in the sour code immutable by default. And if you have a mutable string you can use string->immutable-string https://docs.racket-lang.org/reference/strings.html#%28def._...