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Is it an error for a subsequence description to index elements that are
"off the end" of a sequence? By analogy with ELT, it should be, but I
have seen a couple of implementations that quietly take the intersection
of the intervals and go on from there? This would be true for SUBSEQ as
well as any sequence function that allows :START and :END keywords.
In particular, is (subseq #(1 2 3) 0 5) an error?
I don't see any clear statement in the book about this, but in my
opinion this should "be an error" and should probably be required to
signal an error.