make-specialized-array has an optional initial value.

> On Apr 11, 2026, at 22:23, John Cowan <xxxxxx@ccil.org> wrote:
>
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> I'm not sure what to call such an array: a zero/null matrix is the
> particular case where the number of dimensions is 2 and the value is
> 0. In CL you can create such an array with make-array by using the
> keyword argument :initial-element, which is mutually exclusive with
> providing a nested list with :initial-contents.
>
> Since it is trivial to create a generalized array like this with
> make-array by passing a getter like (lambda (x) <expr>), it should
> return a mutable specialized array.