fill-pointers and adjust-array

[David Bein <pyrnj!pyramid!bein@RUTGERS.EDU>]

Regarding the last message, I think that ADJUST-ARRAY should have the
following semantics for its :fill-pointer argument.

(1) If :fill-pointer is NIL or not supplied, it defaults to the
    current value of the vector's fill-pointer.
(2) If :fill-pointer is T, then the fill-pointer is set to the
    minimum of its current value or the length of the resulting
    vector.
(3) Otherwise, :fill-pointer should be a non-negative integer less than
    or equal to the size of the resulting array.

In all cases, an error occurs if the final value of the fill-pointer
is out of bounds.

--David