Dick King <[EMAIL PROTECTED]> writes:

> The canonical way to efficiently store large numbers of integers is
>
>   (make-array the-size :element-type '(signed-byte 32))
>
> or whatever.  There are no guarantees, but CMUCL seems to store
> these as bytes rather than as type t.

There _are_ guarantees, at least within each given release: see the
function UPGRADED-ARRAY-ELEMENT-TYPE.

Cheers,

Christophe
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