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All arrays can be adjustable?

    Date: Wed, 20 May 87 22:45:04 PDT
    From: edsel!bhopal!jonl@navajo.stanford.edu (Jon L White)

    See CLtL page 34 where simple-array is defined as a subtype of array.
    Note also that everywhere "subtype" is used, it means "proper subtype".  

CLtL, page 33: "If x is a supertype of y, then any object of type y is also of type x,
and y is said to be a subtype of x."  Doesn't sound like "proper subtype" to me.
Also, in both Symbolics and Lucid, (subtypep x x) => t for every type I tried.