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Looks good, but I still want the document to emphasize that the portable program should assume string-append! can be no more efficient as string-append. (Of course it's fine to use it on implementations on which you know string-append! is more efficient. It's just that you can't count on it in general.) I wonder if there's better example than translate-space-to-newline for string-append! --- I think that's not a style to be encouraged. --shiro