> Erroring on exact ints outside the range 0-255 works for me when SRFI > 170 is available. Great, let's do it. But unless the programmer is catching that error, it may lead to an exit with a different exit code :) We should figure out which. Code 1 is not a good error-exit code, because it's quite often used as boolean false (e.g. grep uses code 1 to indicate it didn't find any matches.