Unless one really-really *needs* portability to R6RS *right now* (which
is conceivable but unlikely), I suggest simply going full Racket.
I decided that going full Racket was the most practical for me. My
backup plan is that, if I ever do need to go RnRS, I know how to port my
code. I now suspect that I'll never need to do a port, since Racket has
done everything I've needed for years. I also see a lot of the
innovation happening in Racket lately, which I think further reduces the
likelihood of ever wanting to port.
Neil V.
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