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| ANSI Common Lisp 17 Sequences 17.3 Dictionary of Sequences
17.3.2 copy-seq | Function
  Syntax: copy-seq sequence copied-sequence Arguments and Values: sequence - a proper sequence. copied-sequence - a proper sequence. Description: Creates a copy of sequence. The elements of the new sequence are the same as the corresponding elements of the given sequence. If sequence is a vector, the result is a fresh simple array of rank one that has the same actual array element type as sequence. If sequence is a list, the result is a fresh list. Examples:
       (setq str "a string")  "a string"
       (equalp str (copy-seq str))  true
       (eql str (copy-seq str))  false
  Exceptional Situations: Should be prepared to signal an error of type type-error if sequence is not a proper sequence. See Also: copy-list Notes: From a functional standpoint,
       (copy-seq x) ==(subseq x 0)
However, the programmer intent is typically very different in these two cases. Allegro CL Implementation Details: None.

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