ADJUST-ARRAY-NOT-ADJUSTABLE

[David A. Moon <Moon@STONY-BROOK.SCRC.Symbolics.COM>]

The wording of your proposal is such that it implies that implementations
that ignore the :ADJUSTABLE argument and simply make all arrays adjustable
would no longer be valid.  I doubt that you intended this.  Implementations
should not be required to implement the non-adjustability complexity if
they don't need it.

Your comment about dead arrays is too obscure.

Having ADJUST-ARRAY sometimes adjust the original array and sometimes
make a copy is dangerous.  I suppose it's no more dangerous than
NREVERSE and SORT, but we know that programmers from all walks of life
consistently have trouble using NREVERSE and SORT correctly.  I'd like
to see some thought given to improving the proposal to make it less
dangerous.