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Why (substring "abc" 0 4) does not return "abc" instead of an error?


From: Bastien
Subject: Why (substring "abc" 0 4) does not return "abc" instead of an error?
Date: Mon, 16 Jul 2012 01:15:03 +0200
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.1.50 (gnu/linux)

As the subject says: I wonder why 

  (substring "abc" 0 4)

does not return "abc".

Is it a design choice or due to some implementation 
constraints?

Thanks,

-- 
 Bastien




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