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From: Steve Bacher (C.S.Draper Lab)
To: common-lisp <common-lisp at SU-AI>
Subject: subseq
 How about
   (subseq #(1 2 3) 0 5 :signal-error nil)  ?
 This seems ideal to me, since the programmer's intention (i.e. whether
 or not an out-of-bounds condition is expected) is stated right there in
 the function call form.