|  Why not do what python does?

Thanks for an interesting suggestion, Alex!

However, we are in typo-fixing mode here.  In the
interests of helping this discussion converge I'm 
going to exercise my dictatorial powers.  Though Alex's
suggestion has its attractions, I judge it too big a change
to apply at this stage in the H98 process.  I think we
should adopt one of the three alternatives I proposed.
No one has supported C, so we are down to:

(A) Make them defined for any n.  If n < 0, do something reasonable:
        take:   give empty list
        drop:   give whole list

(B) Make them defined for n > length xs, but fail for n < 0.


I've heard suppport for both.  Personally I 
favour (A) but only mildly.  (B) is a smaller change.

Simon

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