[racket] Math library ready for testing

> Or maybe using a : or something to separate rows for 2D arrays?
> (array 1 2 : 3 4)
>
> (array 1 0 0 0 0 0
>      : 0 1 0 0 0 0
>      : 0 0 1 0 0 0
>      : 0 0 0 1 0 0
>      : 0 0 0 0 1 0
>      : 0 0 0 0 0 1)
>
>
What about something like:

    (array #:cols 6
      1 0 0 0 0 0
      0 1 0 0 0 0
      0 0 1 0 0 0
      0 0 0 1 0 0
      0 0 0 0 1 0
      0 0 0 0 0 1)

where an extra #:cols argument lets the system know now many columns there
are per row?
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