This page is part of the web mail archives of SRFI 13 from before July 7th, 2015. The new archives for SRFI 13 contain all messages, not just those from before July 7th, 2015.
To support pure functional programming, it seems to me that there ought to be two new procedures: (string-set string i char) -> string (string-fill s char [start end]) -> string which would be like their "!" brethren, except they return new strings instead of altering their arguments. -dan