> My question is, then, why would such a practical procedure missing from
> Racket's string API?
This may be related to your question: a discussion on adding a
string-trim-like function to the standard library, as opposed to
leaving it to the SRFI's:
http://lists.racket-lang.org/dev/archive/2012-April/009294.html
Following that discussion, string-trim is in the standard library in
the pre-release of Racket:
http://pre.racket-lang.org/docs/html/reference/strings.html#(def._((lib._racket/string..rkt)._string-trim))
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